{"id":23338,"date":"2026-03-31T23:32:53","date_gmt":"2026-03-31T15:32:53","guid":{"rendered":"https:\/\/viox.com\/?p=23338"},"modified":"2026-03-31T23:32:56","modified_gmt":"2026-03-31T15:32:56","slug":"us-low-voltage-circuit-breaker-standards-explained-ul-489-ul-1066-nema-ab-and-nec","status":"publish","type":"post","link":"https:\/\/test.viox.com\/bn\/us-low-voltage-circuit-breaker-standards-explained-ul-489-ul-1066-nema-ab-and-nec\/","title":{"rendered":"US Low-Voltage Circuit Breaker Standards Explained: ANSI, IEEE, NEMA, UL, NEC, UL 489, UL 1066, NEMA AB, and IEEE C37"},"content":{"rendered":"<div class=\"product-intro\">\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Engineer-reviewing-low-voltage-circuit-breaker-standards-in-front-of-switchgear-and-distribution-equipment.webp\" alt=\"Engineer reviewing low-voltage circuit breaker standards in front of switchgear and distribution equipment\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">An engineer reviewing US low-voltage circuit breaker standards and documentation in a switchgear facility.<\/figcaption><\/figure>\n<p>If you work with low-voltage circuit breakers in the United States, the hardest part is often not the breaker itself. It is figuring out who does what in the standards system.<\/p>\n<p>People see names like:<\/p>\n<ul>\n<li><strong>\u098f\u098f\u09a8\u098f\u09b8\u0986\u0987<\/strong><\/li>\n<li><strong>\u0986\u0987\u0987\u0987\u0987<\/strong><\/li>\n<li><strong>NEMA<\/strong><\/li>\n<li><strong>\u0989\u09b2<\/strong><\/li>\n<li><strong>NFPA<\/strong><\/li>\n<li><strong>\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/strong><\/li>\n<li><strong>UL 1066<\/strong><\/li>\n<li><strong>NEMA AB<\/strong><\/li>\n<li><strong>IEEE C37 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09c7<\/strong><\/li>\n<li><strong>\u098f\u09a8\u0987\u09b8\u09bf<\/strong><\/li>\n<\/ul>\n<p>and assume they all do the same job. They do not. Some are standards coordinators, some are standards developers, some are testing and certification organizations, and one of them is the installation code rather than a product standard.<\/p>\n<p>The simplest way to understand them is this:<\/p>\n<ul>\n<li><strong>\u098f\u098f\u09a8\u098f\u09b8\u0986\u0987<\/strong> is the coordination and approval layer for American National Standards, not the organization that writes every technical breaker rule itself.<\/li>\n<li><strong>\u0986\u0987\u0987\u0987\u0987<\/strong> \u098f\u09ac\u0982 <strong>NEMA<\/strong> are standard-development paths.<\/li>\n<li><strong>UL Standards &amp; Engagement<\/strong> develops standards, while <strong>UL Solutions<\/strong> is associated with testing, evaluation, and certification activity.<\/li>\n<li><strong>NFPA<\/strong> publishes the <strong>\u098f\u09a8\u0987\u09b8\u09bf<\/strong>, \u09ab\u09bf\u0989\u099c \u09a7\u09be\u09b0\u0995, \u098f\u09ac\u0982 <strong>\u098f\u09a8\u0987\u09b8\u09bf<\/strong> is the installation code, not a product listing standard.<\/li>\n<li><strong>\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/strong> \u098f\u09ac\u0982 <strong>NEMA AB 1<\/strong> sit in the molded-case breaker world.<\/li>\n<li><strong>UL 1066<\/strong> and the low-voltage <strong>IEEE \/ ANSI-NEMA C37<\/strong> family sit in the low-voltage power circuit breaker world.<\/li>\n<\/ul>\n<p>That is the core framework. The rest of this article explains what each one means in practice and how they fit together when selecting or specifying breakers in the US market.<\/p>\n<h2>\u0995\u09c0 Takeaways<\/h2>\n<ul>\n<li><strong>\u098f\u098f\u09a8\u098f\u09b8\u0986\u0987<\/strong> approves American National Standards processes; it is not the same thing as IEEE, NEMA, UL, or NEC.<\/li>\n<li><strong>\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/strong> \u098f\u09ac\u0982 <strong>UL 1066<\/strong> are not competing labels for the same breaker family.<\/li>\n<li><strong>UL 489 \/ NEMA AB<\/strong> point toward the molded-case circuit breaker world.<\/li>\n<li><strong>UL 1066 \/ IEEE C37<\/strong> point toward the low-voltage power circuit breaker world.<\/li>\n<li><strong>\u098f\u09a8\u098f\u09ab\u09aa\u09bf\u098f \u09ed\u09e6 (\u098f\u09a8\u0987\u09b8\u09bf)<\/strong> governs installation and application, while UL, NEMA, and IEEE documents govern product categories, construction expectations, testing frameworks, or related guidance.<\/li>\n<li><strong>OSHA NRTL<\/strong> is a regulatory recognition framework for testing laboratories, not a breaker standard.<\/li>\n<\/ul>\n<h2>\u09a6\u09cd\u09b0\u09c1\u09a4 \u09b0\u09c7\u09ab\u09be\u09b0\u09c7\u09a8\u09cd\u09b8 \u099f\u09c7\u09ac\u09bf\u09b2<\/h2>\n<table style=\"border-collapse: collapse; width: 100%; text-align: left;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"padding: 8px;\">\u09a8\u09be\u09ae<\/th>\n<th style=\"padding: 8px;\">What It Is<\/th>\n<th style=\"padding: 8px;\">Typical Role in the Breaker Ecosystem<\/th>\n<th style=\"padding: 8px;\">\u5b9e\u9645\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 8px;\"><strong>\u098f\u098f\u09a8\u098f\u09b8\u0986\u0987<\/strong><\/td>\n<td style=\"padding: 8px;\">Standards coordination and approval body<\/td>\n<td style=\"padding: 8px;\">Oversees ANSI-approved consensus process<\/td>\n<td style=\"padding: 8px;\">Confirms process and consensus, not every technical clause<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>\u0986\u0987\u0987\u0987\u0987<\/strong><\/td>\n<td style=\"padding: 8px;\">Standards development organization<\/td>\n<td style=\"padding: 8px;\">Technical standards path, especially in power switchgear families like C37<\/td>\n<td style=\"padding: 8px;\">Core technical source for many power breaker standards<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>NEMA<\/strong><\/td>\n<td style=\"padding: 8px;\">Industry association and standards development organization<\/td>\n<td style=\"padding: 8px;\">Publishes molded-case breaker and switchgear-related standards and guides<\/td>\n<td style=\"padding: 8px;\">Key source for AB and some ANSI\/NEMA C37 documents<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>UL Standards &amp; Engagement \/ UL Solutions<\/strong><\/td>\n<td style=\"padding: 8px;\">Standards development plus testing\/certification ecosystem<\/td>\n<td style=\"padding: 8px;\">Product standards and product evaluation framework<\/td>\n<td style=\"padding: 8px;\">Central to product listing and certification discussions<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>NFPA \/ NEC<\/strong><\/td>\n<td style=\"padding: 8px;\">Code publisher and installation code<\/td>\n<td style=\"padding: 8px;\">Field design, installation, and inspection rules<\/td>\n<td style=\"padding: 8px;\">Governs how listed breakers may be applied<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>OSHA NRTL<\/strong><\/td>\n<td style=\"padding: 8px;\">Government recognition program<\/td>\n<td style=\"padding: 8px;\">Recognizes private-sector testing labs for certain product certifications<\/td>\n<td style=\"padding: 8px;\">Regulatory recognition layer, not a product standard<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>The Fast Mental Model<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Technical-infographic-showing-the-relationship-between-ANSI-IEEE-NEMA-UL-NEC-and-OSHA-NRTL.webp\" alt=\"Technical infographic showing the relationship between ANSI, IEEE, NEMA, UL, NEC, and OSHA NRTL\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">A visual guide detailing the interrelationship between major US electrical standards organizations like ANSI, IEEE, UL, and NEC.<\/figcaption><\/figure>\n<p>When US breaker standards feel chaotic, this simplified hierarchy usually helps:<\/p>\n<ul>\n<li><strong>\u098f\u098f\u09a8\u098f\u09b8\u0986\u0987<\/strong> approves the consensus process<\/li>\n<li><strong>\u0986\u0987\u0987\u0987\u0987<\/strong>, <strong>NEMA<\/strong>, <strong>UL Standards &amp; Engagement<\/strong>, \u098f\u09ac\u0982 <strong>NFPA<\/strong> develop standards or codes in their own lanes<\/li>\n<li><strong>UL Solutions<\/strong> and other recognized bodies evaluate products to applicable standards<\/li>\n<li><strong>OSHA NRTL<\/strong> recognizes laboratories for defined certification scopes<\/li>\n<li><strong>NEC (NFPA 70)<\/strong> tells you how equipment must be installed and applied<\/li>\n<\/ul>\n<p>Once that structure is clear, the breaker-family mapping becomes easier:<\/p>\n<ul>\n<li><strong>UL 489 \/ NEMA AB<\/strong> point toward molded-case breaker practice<\/li>\n<li><strong>UL 1066 \/ IEEE C37<\/strong> \u09a8\u09bf\u09ae\u09cd\u09a8-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u098f\u09ac\u0982 \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0 \u0985\u09a8\u09c1\u09b6\u09c0\u09b2\u09a8\u09c7\u09b0 \u09a6\u09bf\u0995\u09c7 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6 \u0995\u09b0\u09c7<\/li>\n<\/ul>\n<h2>\u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u09af\u09c1\u0995\u09cd\u09a4\u09b0\u09be\u09b7\u09cd\u099f\u09cd\u09b0\u09c7\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u0995\u09be\u09a0\u09be\u09ae\u09cb\u09a4\u09c7 \u0995\u09c7 \u0995\u09c0 \u0995\u09b0\u09c7<\/h2>\n<p>\u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09a8\u09a5\u09bf\u0997\u09c1\u09b2\u09bf\u09b0 \u09a4\u09c1\u09b2\u09a8\u09be \u0995\u09b0\u09be\u09b0 \u0986\u0997\u09c7, \u09aa\u09cd\u09b0\u09a4\u09bf\u09b7\u09cd\u09a0\u09be\u09a8\u0997\u09c1\u09b2\u09bf\u0995\u09c7 \u0986\u09b2\u09be\u09a6\u09be \u0995\u09b0\u09a4\u09c7 \u09b8\u09be\u09b9\u09be\u09af\u09cd\u09af \u0995\u09b0\u09c7\u0964.<\/p>\n<h3>\u098f\u098f\u09a8\u098f\u09b8\u0986\u0987<\/h3>\n<p><strong>\u098f\u098f\u09a8\u098f\u09b8\u0986\u0987<\/strong> \u098f\u09b0 \u09ae\u09be\u09a8\u09c7 \u09b9\u09b2 <strong>\u0986\u09ae\u09c7\u09b0\u09bf\u0995\u09be\u09a8 \u09a8\u09cd\u09af\u09be\u09b6\u09a8\u09be\u09b2 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1\u09b8 \u0987\u09a8\u09b8\u09cd\u099f\u09bf\u099f\u09bf\u0989\u099f<\/strong>. \u0964 \u098f\u09b0 \u09ad\u09c2\u09ae\u09bf\u0995\u09be \u09b9\u09b2 \u09b8\u09ae\u09a8\u09cd\u09ac\u09af\u09bc \u098f\u09ac\u0982 \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09a8\u0964 ANSI \u09ac\u09cd\u09af\u0995\u09cd\u09a4\u09bf\u0997\u09a4\u09ad\u09be\u09ac\u09c7 \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0\u09b0\u09be \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09c7\u09a8 \u098f\u09ae\u09a8 \u09aa\u09cd\u09b0\u09a4\u09bf\u099f\u09bf \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09b2\u09c7\u0996\u09c7 \u09a8\u09be\u0964 \u09aa\u09b0\u09bf\u09ac\u09b0\u09cd\u09a4\u09c7, \u098f\u099f\u09bf \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09aa\u09cd\u09b0\u0995\u09cd\u09b0\u09bf\u09af\u09bc\u09be\u0997\u09c1\u09b2\u09bf\u0995\u09c7 \u0985\u09a8\u09c1\u09ae\u09cb\u09a6\u09a8 \u0995\u09b0\u09c7 \u098f\u09ac\u0982 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09a1\u09c7\u09ad\u09c7\u09b2\u09aa\u09be\u09b0\u09a6\u09c7\u09b0 \u09b8\u09cd\u09ac\u09c0\u0995\u09c3\u09a4\u09bf \u09a6\u09c7\u09af\u09bc \u09af\u09be\u09b0\u09be \u0986\u09ae\u09c7\u09b0\u09bf\u0995\u09be\u09a8 \u09a8\u09cd\u09af\u09be\u09b6\u09a8\u09be\u09b2 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09a8\u09a5\u09bf\u0997\u09c1\u09b2\u09bf \u09b8\u09be\u09ae\u09a8\u09c7 \u0986\u09a8\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7\u0964.<\/p>\n<p>\u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09bf\u0995 \u0985\u09b0\u09cd\u09a5\u09c7, ANSI \u09b9\u09b2 \u09aa\u09cd\u09b0\u0995\u09cd\u09b0\u09bf\u09af\u09bc\u09be \u098f\u09ac\u0982 \u0990\u0995\u09ae\u09a4\u09cd\u09af \u09b8\u09cd\u09a4\u09b0\u0964.<\/p>\n<h3>\u0986\u0987\u0987\u0987\u0987<\/h3>\n<p><strong>\u0986\u0987\u0987\u0987\u0987<\/strong> \u09b9\u09af\u09bc <strong>\u0987\u09a8\u09b8\u09cd\u099f\u09bf\u099f\u09bf\u0989\u099f \u0985\u09ab \u0987\u09b2\u09c7\u0995\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u0985\u09cd\u09af\u09be\u09a8\u09cd\u09a1 \u0987\u09b2\u09c7\u0995\u099f\u09cd\u09b0\u09a8\u09bf\u0995\u09cd\u09b8 \u0987\u099e\u09cd\u099c\u09bf\u09a8\u09bf\u09af\u09bc\u09be\u09b0\u09cd\u09b8<\/strong>. \u0964 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09ac\u09bf\u09b6\u09cd\u09ac\u09c7, IEEE \u098f\u0995\u099f\u09bf \u09aa\u09cd\u09b0\u09a7\u09be\u09a8 \u09aa\u09cd\u09b0\u09af\u09c1\u0995\u09cd\u09a4\u09bf\u0997\u09a4 \u09ae\u09be\u09a8 \u09aa\u09a5, \u09ac\u09bf\u09b6\u09c7\u09b7 \u0995\u09b0\u09c7 \u098f\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 <strong>C37 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0<\/strong> \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0 \u098f\u09ac\u0982 \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09c3\u09a4 \u09b9\u09af\u09bc\u0964.<\/p>\n<p>\u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09bf\u0995 \u0985\u09b0\u09cd\u09a5\u09c7, IEEE \u098f\u0995\u099f\u09bf \u09aa\u09cd\u09b0\u09af\u09c1\u0995\u09cd\u09a4\u09bf\u0997\u09a4 \u09ae\u09be\u09a8-\u09b0\u099a\u09a8\u09be \u09b8\u0982\u09b8\u09cd\u09a5\u09be\u0964.<\/p>\n<h3>NEMA<\/h3>\n<p><strong>NEMA<\/strong> \u09b9\u09af\u09bc <strong>\u099c\u09be\u09a4\u09c0\u09af\u09bc \u09ac\u09c8\u09a6\u09cd\u09af\u09c1\u09a4\u09bf\u0995 \u09aa\u09cd\u09b0\u09b8\u09cd\u09a4\u09c1\u09a4\u0995\u09be\u09b0\u0995 \u09b8\u09ae\u09bf\u09a4\u09bf<\/strong>. \u0964 \u098f\u099f\u09bf \u098f\u0995\u099f\u09bf \u09b6\u09bf\u09b2\u09cd\u09aa \u09b8\u09ae\u09bf\u09a4\u09bf \u098f\u09ac\u0982 ANSI-\u09b8\u09cd\u09ac\u09c0\u0995\u09c3\u09a4 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09a1\u09c7\u09ad\u09c7\u09b2\u09aa\u09be\u09b0 \u0989\u09ad\u09af\u09bc\u0987\u0964 \u09a8\u09bf\u09ae\u09cd\u09a8-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0995\u09be\u099c\u09c7\u09b0 \u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u09c7, \u098f\u099f\u09bf \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3 \u0995\u09be\u09b0\u09a3 \u098f\u099f\u09bf \u09aa\u09cd\u09b0\u0995\u09be\u09b6 \u0995\u09b0\u09c7 <strong>NEMA AB<\/strong> molded-case \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u09aa\u09b0\u09bf\u09ac\u09be\u09b0 \u098f\u09ac\u0982 \u098f\u09b0 \u0985\u0982\u09b6\u0997\u09c1\u09b2\u09bf\u09a4\u09c7\u0993 \u099c\u09a1\u09bc\u09bf\u09a4 <strong>C37<\/strong> \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09b2\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09b8\u09cd\u0995\u09c7\u09aa\u0964.<\/p>\n<p>\u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09bf\u0995 \u0985\u09b0\u09cd\u09a5\u09c7, NEMA \u098f\u0995\u099f\u09bf \u09b6\u09bf\u09b2\u09cd\u09aa \u09b8\u0982\u09b8\u09cd\u09a5\u09be \u098f\u09ac\u0982 \u098f\u0995\u099f\u09bf \u09b8\u0995\u09cd\u09b0\u09bf\u09af\u09bc \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09aa\u09cd\u09b0\u0995\u09be\u09b6\u0995 \u0989\u09ad\u09af\u09bc\u0987\u0964.<\/p>\n<h3>\u0989\u09b2<\/h3>\n<p>\u09a8\u09be\u09ae <strong>\u0989\u09b2<\/strong> \u09aa\u09cd\u09b0\u09be\u09af\u09bc\u09b6\u0987 \u09b8\u09ac\u099a\u09c7\u09af\u09bc\u09c7 \u09ac\u09c7\u09b6\u09bf \u09ac\u09bf\u09ad\u09cd\u09b0\u09be\u09a8\u09cd\u09a4\u09bf\u09b0 \u09b8\u09c3\u09b7\u09cd\u099f\u09bf \u0995\u09b0\u09c7 \u0995\u09be\u09b0\u09a3 \u09b2\u09cb\u0995\u09c7\u09b0\u09be \u098f\u099f\u09bf\u0995\u09c7 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09b2\u09c7\u0996\u09be \u098f\u09ac\u0982 \u09aa\u09a3\u09cd\u09af \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u0989\u09ad\u09af\u09bc\u0987 \u09ac\u09cb\u099d\u09be\u09a4\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09c7\u0964.<\/p>\n<p>\u098f\u0995\u099f\u09bf \u0989\u099a\u09cd\u099a \u09b8\u09cd\u09a4\u09b0\u09c7:<\/p>\n<ul>\n<li><strong>UL Standards &amp; Engagement<\/strong> \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u0989\u09a8\u09cd\u09a8\u09af\u09bc\u09a8\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09af\u09c1\u0995\u09cd\u09a4<\/li>\n<li><strong>UL Solutions<\/strong> \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be, \u09ae\u09c2\u09b2\u09cd\u09af\u09be\u09af\u09bc\u09a8 \u098f\u09ac\u0982 \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u0995\u09be\u09b0\u09cd\u09af\u0995\u09b2\u09be\u09aa\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09af\u09c1\u0995\u09cd\u09a4<\/li>\n<\/ul>\n<p>\u09b8\u09c1\u09a4\u09b0\u09be\u0982 \u09af\u0996\u09a8 \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0\u09b0\u09be \u09ac\u09b2\u09c7\u09a8 \u201c\u098f\u099f\u09bf \u098f\u0995\u099f\u09bf UL \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0,\u201d \u09a4\u0996\u09a8 \u09a4\u09be\u09b0\u09be \u09aa\u09cd\u09b0\u09be\u09af\u09bc\u09b6\u0987 \u09ac\u09cb\u099d\u09be\u09a4\u09c7 \u099a\u09be\u09a8 \u09af\u09c7 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u099f\u09bf\u0995\u09c7 \u098f\u0995\u099f\u09bf UL \u09aa\u09a3\u09cd\u09af \u09ae\u09be\u09a8\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09ae\u09c2\u09b2\u09cd\u09af\u09be\u09af\u09bc\u09a8 \u0995\u09b0\u09be \u09b9\u09af\u09bc\u09c7\u099b\u09c7 \u09af\u09c7\u09ae\u09a8 <strong>\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/strong> \u09ac\u09be <strong>UL 1066<\/strong> \u098f\u0995\u099f\u09bf \u09b8\u09cd\u09ac\u09c0\u0995\u09c3\u09a4 \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u09b8\u0982\u09b8\u09cd\u09a5\u09be \u09a6\u09cd\u09ac\u09be\u09b0\u09be\u0964.<\/p>\n<h3>NFPA \u098f\u09ac\u0982 NEC<\/h3>\n<p><strong>NFPA<\/strong> \u09b9\u09af\u09bc <strong>\u09a8\u09cd\u09af\u09be\u09b6\u09a8\u09be\u09b2 \u09ab\u09be\u09af\u09bc\u09be\u09b0 \u09aa\u09cd\u09b0\u09cb\u099f\u09c7\u0995\u09b6\u09a8 \u0985\u09cd\u09af\u09be\u09b8\u09cb\u09b8\u09bf\u09af\u09bc\u09c7\u09b6\u09a8<\/strong>. \u0964 \u098f\u099f\u09bf \u09aa\u09cd\u09b0\u0995\u09be\u09b6 \u0995\u09b0\u09c7 <strong>NFPA 70<\/strong>, \u09af\u09be \u09ac\u09c7\u09b6\u09bf \u09aa\u09b0\u09bf\u099a\u09bf\u09a4 <strong>\u098f\u09a8\u0987\u09b8\u09bf<\/strong>, \u0985\u09a5\u09ac\u09be \u09a8\u09cd\u09af\u09be\u09b6\u09a8\u09be\u09b2 \u0987\u09b2\u09c7\u0995\u099f\u09cd\u09b0\u09bf\u0995\u09cd\u09af\u09be\u09b2 \u0995\u09cb\u09a1\u0964.<\/p>\n<p>\u09ae\u09a8\u09c7 \u09b0\u09be\u0996\u09be\u09b0 \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3 \u09ac\u09bf\u09b7\u09af\u09bc \u09b9\u09b2:<\/p>\n<ul>\n<li><strong>NFPA<\/strong> \u09b9\u09b2 \u09aa\u09cd\u09b0\u0995\u09be\u09b6\u0995<\/li>\n<li><strong>\u098f\u09a8\u0987\u09b8\u09bf<\/strong> \u09b9\u09b2 \u0995\u09cb\u09a1 \u09a8\u09a5\u09bf<\/li>\n<\/ul>\n<h3>OSHA NRTL<\/h3>\n<p>\u09a6\u09cd\u09af <strong>OSHA NRTL \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae<\/strong> \u098f\u0995\u099f\u09bf \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be\u0997\u09be\u09b0 \u09a8\u09af\u09bc \u098f\u09ac\u0982 \u098f\u0995\u099f\u09bf \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09a8\u09af\u09bc\u0964 \u098f\u099f\u09bf \u09ac\u09cd\u09af\u0995\u09cd\u09a4\u09bf\u0997\u09a4 \u0996\u09be\u09a4\u09c7\u09b0 \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be\u0997\u09be\u09b0\u0997\u09c1\u09b2\u09bf\u09b0 \u099c\u09a8\u09cd\u09af \u098f\u0995\u099f\u09bf \u09b8\u09b0\u0995\u09be\u09b0\u09c0 \u09b8\u09cd\u09ac\u09c0\u0995\u09c3\u09a4\u09bf \u0995\u09be\u09a0\u09be\u09ae\u09cb \u09af\u09be \u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u09b8\u09cd\u09ac\u09c0\u0995\u09c3\u09a4 \u09b8\u09c1\u09af\u09cb\u0997\u09c7\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09aa\u09a3\u09cd\u09af\u0997\u09c1\u09b2\u09bf\u0995\u09c7 \u09aa\u09cd\u09b0\u09a4\u09cd\u09af\u09af\u09bc\u09bf\u09a4 \u0995\u09b0\u09c7\u0964.<\/p>\n<p>\u098f\u099f\u09bf \u09b8\u09ae\u09cd\u09ae\u09a4\u09bf \u0986\u09b2\u09cb\u099a\u09a8\u09be\u09af\u09bc \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3 \u0995\u09be\u09b0\u09a3 \u09ac\u09be\u099c\u09be\u09b0 \u09aa\u09cd\u09b0\u09be\u09af\u09bc\u09b6\u0987 \u098f\u09ae\u09a8\u09ad\u09be\u09ac\u09c7 \u0995\u09a5\u09be \u09ac\u09b2\u09c7 \u09af\u09c7\u09a8 \u201cUL\u201d \u098f\u0995\u09ae\u09be\u09a4\u09cd\u09b0 \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u09aa\u09a5\u0964 \u09ac\u09be\u09b8\u09cd\u09a4\u09ac\u09c7, \u09a8\u09bf\u09af\u09bc\u09a8\u09cd\u09a4\u09cd\u09b0\u0995 \u09af\u09c1\u0995\u09cd\u09a4\u09bf\u099f\u09bf \u09ac\u09bf\u09b8\u09cd\u09a4\u09c3\u09a4: OSHA \u09b8\u0982\u099c\u09cd\u099e\u09be\u09af\u09bc\u09bf\u09a4 \u09aa\u09a3\u09cd\u09af-\u09ae\u09be\u09a8 \u09b8\u09c1\u09af\u09cb\u0997\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be\u09b0 \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be\u0997\u09be\u09b0\u0997\u09c1\u09b2\u09bf\u0995\u09c7 \u09b8\u09cd\u09ac\u09c0\u0995\u09c3\u09a4\u09bf \u09a6\u09c7\u09af\u09bc\u0964.<\/p>\n<h2>\u0995\u09c7\u09a8 \u098f\u0987 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1\u0997\u09c1\u09b2\u09bf \u09ac\u09bf\u09ad\u09cd\u09b0\u09be\u09a8\u09cd\u09a4 \u09b9\u09af\u09bc<\/h2>\n<p>\u09ac\u09bf\u09ad\u09cd\u09b0\u09be\u09a8\u09cd\u09a4\u09bf \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u09a4\u09bf\u09a8\u099f\u09bf \u0995\u09be\u09b0\u09a3\u09c7 \u0998\u099f\u09c7:<\/p>\n<h3>1. \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0\u09b0\u09be \u201c\u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1\u201d \u09ac\u09b2\u09a4\u09c7 \u09ac\u09bf\u09ad\u09bf\u09a8\u09cd\u09a8 \u099c\u09bf\u09a8\u09bf\u09b8 \u09ac\u09cb\u099d\u09c7\u09a8<\/h3>\n<p>\u0995\u0996\u09a8\u0993 \u0995\u0996\u09a8\u0993 \u09a4\u09be\u09b0\u09be \u09ac\u09cb\u099d\u09be\u09af\u09bc:<\/p>\n<ul>\n<li>\u09aa\u09a3\u09cd\u09af \u09a4\u09be\u09b2\u09bf\u0995\u09be\u09ad\u09c1\u0995\u09cd\u09a4\u09bf \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1<\/li>\n<li>\u09b8\u09b0\u099e\u09cd\u099c\u09be\u09ae \u09a8\u09bf\u09b0\u09cd\u09ae\u09be\u09a3 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1<\/li>\n<li>\u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u0995\u09cb\u09a1<\/li>\n<li>\u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be<\/li>\n<\/ul>\n<p>\u098f\u0997\u09c1\u09b2\u09bf \u098f\u0995\u0987 \u09b6\u09cd\u09b0\u09c7\u09a3\u09c0 \u09a8\u09af\u09bc\u0964.<\/p>\n<h3>2. UL 489 \u098f\u09ac\u0982 UL 1066 \u0989\u09ad\u09af\u09bc\u0987 \u09a8\u09bf\u09ae\u09cd\u09a8-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u0997\u09c1\u09b2\u09bf\u09a4\u09c7 \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af<\/h3>\n<p>\u098f\u099f\u09bf \u09a4\u09be\u09a6\u09c7\u09b0 \u0985\u09a8\u09c1\u09b0\u09c2\u09aa \u09b6\u09cb\u09a8\u09be\u09af\u09bc, \u09a4\u09ac\u09c7 \u09a4\u09be\u09b0\u09be \u09ac\u09bf\u09ad\u09bf\u09a8\u09cd\u09a8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u09a4\u09c8\u09b0\u09bf\u0964.<\/p>\n<h3>3. NEMA AB \u098f\u09ac\u0982 IEEE C37 \u0989\u09ad\u09af\u09bc\u0987 \u09b8\u09bf\u09b0\u09bf\u099c, \u098f\u0995\u0995 \u09a8\u09a5\u09bf \u09a8\u09af\u09bc<\/h3>\n<p>\u09b2\u09cb\u0995\u09c7\u09b0\u09be \u201cNEMA AB\u201d \u09ac\u09be \u201cIEEE C37\u201d \u09ac\u09b2\u09c7 \u09af\u09c7\u09a8 \u09aa\u09cd\u09b0\u09a4\u09bf\u099f\u09bf \u098f\u0995\u099f\u09bf \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1\u0964 \u09ac\u09be\u09b8\u09cd\u09a4\u09ac\u09c7, \u0989\u09ad\u09af\u09bc \u09a8\u09be\u09ae\u0987 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u0995\u09c7 \u09ac\u09cb\u099d\u09be\u09af\u09bc\u0964.<\/p>\n<h3>4. NEC \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09ac\u09bf\u09ad\u09cd\u09b0\u09be\u09a8\u09cd\u09a4 \u09b9\u09af\u09bc<\/h3>\n<p>\u098f\u099f\u09be \u09a8\u09af\u09bc\u0964 NEC \u09b9\u09b2 \u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u0995\u09cb\u09a1, \u09aa\u09a3\u09cd\u09af \u09a4\u09be\u09b2\u09bf\u0995\u09be\u09ad\u09c1\u0995\u09cd\u09a4\u09bf \u09a8\u09af\u09bc\u0964.<\/p>\n<h2>UL 489 \u09ae\u09be\u09a8\u09c7 \u0995\u09c0<\/h2>\n<p><strong>\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/strong> \u09b9\u09b2 \u09ae\u09c2\u09b2 \u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u09b8\u09c1\u09b0\u0995\u09cd\u09b7\u09be \u09ae\u09be\u09a8 \u09af\u09be \u09ac\u09c7\u09b6\u09bf\u09b0\u09ad\u09be\u0997 \u09b2\u09cb\u0995\u09c7\u09b0\u09be \u09b6\u09be\u0996\u09be \u098f\u09ac\u0982 \u09ab\u09bf\u09a1\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8\u0997\u09c1\u09b2\u09bf\u09a4\u09c7 \u09b8\u09be\u09a7\u09be\u09b0\u09a3 molded-case \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09c7 \u0995\u09a5\u09be \u09ac\u09b2\u09be\u09b0 \u09b8\u09ae\u09af\u09bc \u09ae\u09a8\u09c7 \u0995\u09b0\u09c7\u0964.<\/p>\n<p>UL \u09b8\u09b2\u09bf\u0989\u09b6\u09a8 \u0985\u09a8\u09c1\u09b8\u09be\u09b0\u09c7, UL 489 \u0995\u09ad\u09be\u09b0 \u0995\u09b0\u09c7:<\/p>\n<ul>\n<li>molded-case \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0<\/li>\n<li>molded-case \u09b8\u09c1\u0987\u099a<\/li>\n<li>\u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f-\u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0998\u09c7\u09b0<\/li>\n<\/ul>\n<p>\u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09bf\u0995 \u09a8\u0995\u09b6\u09be \u09b6\u09b0\u09cd\u09a4\u09be\u09ac\u09b2\u09c0\u09a4\u09c7, \u098f\u099f\u09bf \u09b9\u09b2 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0 \u09af\u09be \u09aa\u09cd\u09b0\u09be\u09af\u09bc\u09b6\u0987 \u098f\u09b0 \u09b8\u09be\u09a5\u09c7 \u09af\u09c1\u0995\u09cd\u09a4:<\/p>\n<ul>\n<li>\u09aa\u09cd\u09af\u09be\u09a8\u09c7\u09b2\u09ac\u09cb\u09b0\u09cd\u09a1 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0<\/li>\n<li>\u0985\u09a8\u09c7\u0995 \u0995\u09cd\u09b7\u09c1\u09a6\u09cd\u09b0 \u098f\u09ac\u0982 molded-case \u09b6\u09be\u0996\u09be \u09a1\u09bf\u09ad\u09be\u0987\u09b8<\/li>\n<li>\u09b8\u09be\u09a7\u09be\u09b0\u09a3 \u09a8\u09bf\u09ae\u09cd\u09a8-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09ac\u09bf\u09a4\u09b0\u09a3\u09c7 \u09ab\u09bf\u09a1\u09be\u09b0 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0<\/li>\n<li>\u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09ae\u09be\u09ac\u09c7\u09b6\u0997\u09c1\u09b2\u09bf \u09b8\u09be\u09a7\u09be\u09b0\u09a3 \u09ac\u09be\u09a3\u09bf\u099c\u09cd\u09af\u09bf\u0995 \u098f\u09ac\u0982 \u09b6\u09bf\u09b2\u09cd\u09aa \u09b8\u09bf\u09b8\u09cd\u099f\u09c7\u09ae\u09c7 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u0993\u09ad\u09be\u09b0\u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09b8\u09c1\u09b0\u0995\u09cd\u09b7\u09be \u09a1\u09bf\u09ad\u09be\u0987\u09b8 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u0995\u09be\u099c \u0995\u09b0\u09ac\u09c7 \u09ac\u09b2\u09c7 \u0986\u09b6\u09be \u0995\u09b0\u09be \u09b9\u099a\u09cd\u099b\u09c7<\/li>\n<\/ul>\n<p>\u098f\u0987 \u0995\u09be\u09b0\u09a3\u09c7 UL 489 \u09b8\u09c7\u0987 \u09aa\u09a3\u09cd\u09af \u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u09c7\u09b0 \u0995\u09be\u099b\u09be\u0995\u09be\u099b\u09bf \u09ac\u09b8\u09c7 \u09af\u09be \u09ac\u09c7\u09b6\u09bf\u09b0\u09ad\u09be\u0997 \u0995\u09cd\u09b0\u09c7\u09a4\u09be \u09ac\u09b0\u09cd\u09a3\u09a8\u09be \u0995\u09b0\u09ac\u09c7 <a href=\"https:\/\/test.viox.com\/bn\/mcb\/\">MCB<\/a> \u098f\u09ac\u0982 <a href=\"https:\/\/test.viox.com\/bn\/mccb\/\">MCCB<\/a> \u09ac\u09be\u099c\u09be\u09b0\u09c7\u09b0 \u09ad\u09be\u09b7\u09be\u09af\u09bc, \u09af\u09a6\u09bf\u0993 \u09b8\u09a0\u09bf\u0995 \u09b6\u09cd\u09b0\u09c7\u09a3\u09c0 \u09ae\u09cd\u09af\u09be\u09aa\u09bf\u0982 \u09aa\u09a3\u09cd\u09af \u09a8\u0995\u09b6\u09be \u098f\u09ac\u0982 \u09a4\u09be\u09b2\u09bf\u0995\u09be\u09ad\u09c1\u0995\u09cd\u09a4\u09bf \u09aa\u09a5\u09c7\u09b0 \u0989\u09aa\u09b0 \u09a8\u09bf\u09b0\u09cd\u09ad\u09b0 \u0995\u09b0\u09c7\u0964.<\/p>\n<p>\u0986\u09aa\u09a8\u09bf \u09af\u09a6\u09bf \u09b8\u09c7\u0987 \u09ac\u09bf\u09b7\u09af\u09bc\u09c7\u09b0 \u09a1\u09bf\u09ad\u09be\u0987\u09b8-\u09ab\u09cd\u09af\u09be\u09ae\u09bf\u09b2\u09bf \u09b8\u09be\u0987\u09a1\u099f\u09bf \u099a\u09be\u09a8, <a href=\"https:\/\/test.viox.com\/bn\/full-guide-to-molded-case-circuit-breakers-mccbs\/\">\u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1 \u0995\u09c7\u09b8 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 (MCCB) \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09c7 \u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be<\/a> \u09a4\u09be\u09b9\u09b2\u09c7 \u098f\u099f\u09bf \u09b8\u09a0\u09bf\u0995 \u09b8\u09b9\u09be\u09af\u09bc\u0995 \u09aa\u09c3\u09b7\u09cd\u09a0\u09be\u0964.<\/p>\n<h2>UL 1066 \u09ae\u09be\u09a8\u09c7 \u0995\u09c0<\/h2>\n<p><strong>UL 1066<\/strong> \u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af <strong>\u0998\u09c7\u09b0\u09c7\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09c3\u09a4 \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u098f\u09b8\u09bf \u098f\u09ac\u0982 \u09a1\u09bf\u09b8\u09bf \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u09c7\u09b0 \u099c\u09a8\u09cd\u09af<\/strong>.<\/p>\n<p>\u098f\u099f\u09bf \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09a5\u09c7\u0995\u09c7 \u098f\u0995\u099f\u09bf \u09ad\u09bf\u09a8\u09cd\u09a8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0 \u09af\u09be \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 UL 489 \u098f\u09b0 \u09b8\u09be\u09a5\u09c7 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09bf\u09a4\u0964 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09bf\u0995 \u09b8\u09bf\u09b8\u09cd\u099f\u09c7\u09ae \u09a1\u09bf\u099c\u09be\u0987\u09a8\u09c7, UL 1066 \u0985\u09a8\u09c7\u0995 \u09ac\u09c7\u09b6\u09bf \u0998\u09a8\u09bf\u09b7\u09cd\u09a0\u09ad\u09be\u09ac\u09c7 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09bf\u09a4:<\/p>\n<ul>\n<li>\u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0<\/li>\n<li>\u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0<\/li>\n<li>\u09ac\u09c3\u09b9\u09a4\u09cd\u09a4\u09b0 \u09aa\u09cd\u09b0\u09a7\u09be\u09a8 \u098f\u09ac\u0982 \u099f\u09be\u0987 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8<\/li>\n<li>\u09a1\u09cd\u09b0\u0986\u0989\u099f \u09ac\u09be \u0998\u09c7\u09b0-\u09ad\u09bf\u09a4\u09cd\u09a4\u09bf\u0995 \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09b8\u09c7\u09ae\u09cd\u09ac\u09b2\u09bf<\/li>\n<\/ul>\n<p>UL \u09b8\u09b2\u09bf\u0989\u09b6\u09a8 \u098f\u0995\u099f\u09bf \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3 \u0995\u09be\u09b0\u09cd\u09af\u0995\u09b0\u09c0 \u09aa\u09be\u09b0\u09cd\u09a5\u0995\u09cd\u09af \u0989\u09b2\u09cd\u09b2\u09c7\u0996 \u0995\u09b0\u09c7: \u098f\u0987 \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u0997\u09c1\u09b2\u09bf <strong>NEC \u09a6\u09cd\u09ac\u09be\u09b0\u09be \u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u099c\u09a8\u09c0\u09af\u09bc \u09b6\u09be\u0996\u09be-\u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u0993\u09ad\u09be\u09b0\u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09b8\u09c1\u09b0\u0995\u09cd\u09b7\u09be \u09aa\u09cd\u09b0\u09a6\u09be\u09a8\u09c7\u09b0 \u0989\u09a6\u09cd\u09a6\u09c7\u09b6\u09cd\u09af\u09c7 \u09a8\u09af\u09bc<\/strong> UL 489 \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u0997\u09c1\u09b2\u09bf \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u09af\u09c7\u09ad\u09be\u09ac\u09c7 \u0995\u09b0\u09c7\u0964.<\/p>\n<p>\u098f\u099f\u09bf \u0985\u09a8\u09cd\u09af\u09a4\u09ae \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3 \u0995\u09be\u09b0\u09a3 \u09b8\u09cd\u09aa\u09c7\u09b8\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8\u09c7 \u201cUL 489 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u201d-\u098f\u09b0 \u09aa\u09b0\u09bf\u09ac\u09b0\u09cd\u09a4\u09c7 \u201cUL 1066 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u201d \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09be \u0989\u099a\u09bf\u09a4 \u09a8\u09af\u09bc\u0964.<\/p>\n<p>\u09aa\u09a3\u09cd\u09af-\u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u09c7\u09b0 \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f\u09c7\u09b0 \u099c\u09a8\u09cd\u09af, \u098f\u0987 \u09ac\u09bf\u09b7\u09af\u09bc\u099f\u09bf \u0986\u09b0\u0993 \u09b8\u09cd\u09ac\u09be\u09ad\u09be\u09ac\u09bf\u0995\u09ad\u09be\u09ac\u09c7 \u0993\u09ad\u09be\u09b0\u09b2\u09cd\u09af\u09be\u09aa \u0995\u09b0\u09c7 <a href=\"https:\/\/test.viox.com\/bn\/acb\/\">\u098f\u09b8\u09bf\u09ac\u09bf<\/a> \u098f\u09ac\u0982 \u09ac\u09c3\u09b9\u09a4\u09cd\u09a4\u09b0 <a href=\"https:\/\/test.viox.com\/bn\/complete-guide-to-air-circuit-breakers-acb\/\">\u098f\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 (ACB) \u098f\u09b0 \u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be<\/a>, \u0995\u09be\u09b0\u09a3 \u09b8\u09c7\u0996\u09be\u09a8\u09c7\u0987 \u0985\u09a8\u09c7\u0995 \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0986\u09b2\u09cb\u099a\u09a8\u09be \u09ac\u09be\u09b8\u09cd\u09a4\u09ac\u09c7 \u09b6\u09c7\u09b7 \u09b9\u09af\u09bc\u0964.<\/p>\n<h2>UL 489 \u09ac\u09a8\u09be\u09ae UL 1066: \u0986\u09b8\u09b2 \u09aa\u09be\u09b0\u09cd\u09a5\u0995\u09cd\u09af<\/h2>\n<figure style=\"text-align: center; margin: 20px 0;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/img.viox.com\/Comparison-infographic-showing-the-differences-between-UL-489-and-UL-1066-breaker-applications.webp\" alt=\"Comparison infographic showing the differences between UL 489 and UL 1066 breaker applications\" \/><figcaption style=\"font-style: italic; margin-top: 10px; color: #555;\">\u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 (UL 489 \/ NEMA AB) \u09ac\u09a8\u09be\u09ae \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 (UL 1066 \/ IEEE C37) \u098f\u09b0 \u098f\u0995\u099f\u09bf \u099f\u09c0\u0995\u09be\u09af\u09c1\u0995\u09cd\u09a4 \u09ae\u09be\u09a8\u099a\u09bf\u09a4\u09cd\u09b0\u0964.<\/figcaption><\/figure>\n<p>\u09b8\u09ac\u099a\u09c7\u09af\u09bc\u09c7 \u09a6\u09b0\u0995\u09be\u09b0\u09c0 \u09aa\u09be\u09b0\u09cd\u09a5\u0995\u09cd\u09af\u099f\u09bf \u201c\u0995\u09cb\u09a8\u099f\u09bf \u09ad\u09be\u09b2\u201d \u09a4\u09be \u09a8\u09af\u09bc, \u09ac\u09b0\u0982 <strong>\u0986\u09aa\u09a8\u09bf \u0986\u09b8\u09b2\u09c7 \u0995\u09c0 \u09a7\u09b0\u09a8\u09c7\u09b0 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u0995\u09b0\u099b\u09c7\u09a8<\/strong>.<\/p>\n<table style=\"border-collapse: collapse; width: 100%; text-align: left;\" border=\"1\">\n<thead>\n<tr>\n<th style=\"padding: 8px;\">\u09ae\u09be\u09a4\u09cd\u09b0\u09be<\/th>\n<th style=\"padding: 8px;\">\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/th>\n<th style=\"padding: 8px;\">UL 1066<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 8px;\"><strong>\u09aa\u09cd\u09b0\u09be\u09a5\u09ae\u09bf\u0995 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0<\/strong><\/td>\n<td style=\"padding: 8px;\">\u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0<\/td>\n<td style=\"padding: 8px;\">\u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>\u09b8\u09be\u09a7\u09be\u09b0\u09a3 \u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u09aa\u09cd\u09b0\u09b8\u0999\u09cd\u0997<\/strong><\/td>\n<td style=\"padding: 8px;\">\u09aa\u09cd\u09af\u09be\u09a8\u09c7\u09b2\u09ac\u09cb\u09b0\u09cd\u09a1, \u09b6\u09be\u0996\u09be \u098f\u09ac\u0982 \u09ab\u09bf\u09a1\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f, \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09ac\u09bf\u09a4\u09b0\u09a3 \u09b8\u09bf\u09b8\u09cd\u099f\u09c7\u09ae<\/td>\n<td style=\"padding: 8px;\">\u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0, \u09ae\u09c7\u0987\u09a8, \u099f\u09be\u0987, \u09ac\u09c3\u09b9\u09a4\u09cd\u09a4\u09b0 \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09ac\u09bf\u09a4\u09b0\u09a3 \u0985\u09cd\u09af\u09be\u09b8\u09c7\u09ae\u09cd\u09ac\u09b2\u09bf<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>Protection role<\/strong><\/td>\n<td style=\"padding: 8px;\">\u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09b6\u09be\u0996\u09be \/ \u09ab\u09bf\u09a1\u09be\u09b0 \u0993\u09ad\u09be\u09b0\u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09b8\u09c1\u09b0\u0995\u09cd\u09b7\u09be \u09a1\u09bf\u09ad\u09be\u0987\u09b8 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09c3\u09a4 \u09b9\u09af\u09bc<\/td>\n<td style=\"padding: 8px;\">\u0998\u09c7\u09b0 \u098f\u09ac\u0982 \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0 \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f\u09c7 \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09c3\u09a4 \u09b9\u09af\u09bc<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 8px;\"><strong>\u09b8\u09be\u09a7\u09be\u09b0\u09a3 \u09ac\u09be\u099c\u09be\u09b0 \u09b8\u09ae\u09bf\u09a4\u09bf<\/strong><\/td>\n<td style=\"padding: 8px;\">\u09ac\u09be\u099c\u09be\u09b0\u09c7\u09b0 MCB \/ MCCB \u09a6\u09bf\u0995<\/td>\n<td style=\"padding: 8px;\">\u09ac\u09be\u099c\u09be\u09b0\u09c7\u09b0 LV \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \/ ACB \u09a6\u09bf\u0995<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u098f\u0987 \u0995\u09be\u09b0\u09a3\u09c7 \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0\u09a6\u09c7\u09b0 \u098f\u0995\u099f\u09bf \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u0995\u09c7 \u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09a4\u09c1\u09b2\u09a8\u09be \u0995\u09b0\u09be\u09b0 \u09b8\u09ae\u09af\u09bc \u09b8\u09a4\u09b0\u09cd\u0995 \u09b9\u0993\u09af\u09bc\u09be \u0989\u099a\u09bf\u09a4\u0964 \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u09aa\u09be\u09a5, \u09b6\u09be\u09b0\u09c0\u09b0\u09bf\u0995 \u09a8\u09bf\u09b0\u09cd\u09ae\u09be\u09a3, \u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3\u09c7\u09b0 \u09aa\u09cd\u09b0\u09a4\u09cd\u09af\u09be\u09b6\u09be \u098f\u09ac\u0982 \u0989\u09a6\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u098f\u0995\u0987 \u09a8\u09af\u09bc\u0964.<\/p>\n<h2>\u201cNEMA AB\u201d \u0986\u09b8\u09b2\u09c7 \u0995\u09c0 \u09ac\u09cb\u099d\u09be\u09af\u09bc<\/h2>\n<p>\u098f\u0987 \u09ac\u09bf\u09b7\u09af\u09bc\u09c7\u09b0 \u09b8\u09ac\u099a\u09c7\u09af\u09bc\u09c7 \u09a6\u09b0\u0995\u09be\u09b0\u09c0 \u09b8\u09cd\u09aa\u09b7\u09cd\u099f\u09c0\u0995\u09b0\u09a3\u0997\u09c1\u09b2\u09bf\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u098f\u0995\u099f\u09bf \u09b9\u09b2 <strong>NEMA AB UL \u098f\u09b0 \u09ac\u09bf\u09b0\u09c1\u09a6\u09cd\u09a7\u09c7 \u098f\u0995\u099f\u09bf \u098f\u0995\u0995 \u09aa\u09cd\u09b0\u09a4\u09bf\u09af\u09cb\u0997\u09c0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09a8\u09af\u09bc<\/strong>.<\/p>\n<p>\u098f\u099f\u09bf \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09a3\u09cd\u09af \u0997\u09cb\u09b7\u09cd\u09a0\u09c0\u09b0 \u09b8\u09be\u09a5\u09c7 \u09b8\u0982\u09af\u09c1\u0995\u09cd\u09a4 \u098f\u0995\u099f\u09bf \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f \u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u0964.<\/p>\n<h3>NEMA AB 1<\/h3>\n<p>\u0990\u09a4\u09bf\u09b9\u09be\u09b8\u09bf\u0995\u09ad\u09be\u09ac\u09c7, <strong>NEMA AB 1<\/strong> \u09b9\u09b2 \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09a3\u09cd\u09af \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f \u09af\u09be \u098f\u0995\u0987 \u09aa\u09a3\u09cd\u09af \u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u0998\u09a8\u09bf\u09b7\u09cd\u09a0\u09ad\u09be\u09ac\u09c7 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09bf\u09a4 <strong>\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/strong>. \u0964 \u0985\u09a8\u09c7\u0995 \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0 \u098f\u0996\u09a8\u0993 \u098f\u099f\u09bf \u0989\u09b2\u09cd\u09b2\u09c7\u0996 \u0995\u09b0\u09c7\u09a8 \u0995\u09be\u09b0\u09a3 \u09aa\u09c1\u09b0\u09a8\u09cb \u09b8\u09be\u09b9\u09bf\u09a4\u09cd\u09af, \u09aa\u09a3\u09cd\u09af\u09c7\u09b0 \u09a8\u09a5\u09bf \u098f\u09ac\u0982 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be \u09aa\u09c7\u09aa\u09be\u09b0 UL 489 \u098f\u09b0 \u09aa\u09be\u09b6\u09be\u09aa\u09be\u09b6\u09bf AB 1 \u09ad\u09be\u09b7\u09be \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09c7\u0964.<\/p>\n<p>\u09ac\u09b0\u09cd\u09a4\u09ae\u09be\u09a8 \u0989\u09a4\u09cd\u09a4\u09b0 \u0986\u09ae\u09c7\u09b0\u09bf\u0995\u09be\u09b0 \u0985\u09a8\u09c1\u09b6\u09c0\u09b2\u09a8\u09c7, \u09a4\u09ac\u09c7, \u0986\u09b0\u0993 \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3 \u09ac\u09bf\u09b7\u09af\u09bc \u09b9\u09b2 \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09a3\u09cd\u09af \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u0995\u09be\u09a0\u09be\u09ae\u09cb \u098f\u0996\u09a8 \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u098f\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 \u09ac\u09cb\u099d\u09be \u09af\u09be\u09af\u09bc <strong>\u09a4\u09cd\u09b0\u09bf\u09ae\u09c1\u0996\u09c0 UL 489 \/ CSA C22.2 No. 5 \/ NMX-J-266-ANCE \u09b8\u09be\u09b0\u09bf\u09ac\u09a6\u09cd\u09a7\u0995\u09b0\u09a3<\/strong>. \u0964 \u09b8\u09c1\u09a4\u09b0\u09be\u0982 \u0986\u09aa\u09a8\u09bf \u09af\u09a6\u09bf \u09aa\u09c1\u09b0\u09a8\u09cb \u0989\u09aa\u0995\u09b0\u09a3\u09c7 AB 1 \u0989\u09b2\u09cd\u09b2\u09c7\u0996 \u0995\u09b0\u09be \u09a6\u09c7\u0996\u09c7\u09a8, \u09a4\u09ac\u09c7 \u098f\u099f\u09bf\u0995\u09c7 \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1\u09c7\u09b0 \u0987\u09a4\u09bf\u09b9\u09be\u09b8 \u098f\u09ac\u0982 \u09aa\u09a3\u09cd\u09af-\u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u09c7\u09b0 \u09ac\u0982\u09b6\u09c7\u09b0 \u0985\u0982\u09b6 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09bf\u09ac\u09c7\u099a\u09a8\u09be \u0995\u09b0\u09c1\u09a8, \u09b6\u09c1\u09a7\u09c1\u09ae\u09be\u09a4\u09cd\u09b0 \u09ac\u09b0\u09cd\u09a4\u09ae\u09be\u09a8 \u09b8\u0982\u0995\u09cd\u09b7\u09bf\u09aa\u09cd\u09a4 \u09b0\u09c2\u09aa \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09a8\u09af\u09bc \u09af\u09be\u09b0 \u0989\u09aa\u09b0 \u0986\u09aa\u09a8\u09be\u09b0 \u09a8\u09bf\u09b0\u09cd\u09ad\u09b0 \u0995\u09b0\u09be \u0989\u099a\u09bf\u09a4\u0964.<\/p>\n<h3>NEMA AB 4<\/h3>\n<p>NEMA AB 4 \u098f\u0995\u099f\u09bf \u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3-\u09ad\u09bf\u09a4\u09cd\u09a4\u09bf\u0995 \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f\u0964 \u098f\u099f\u09bf \u09ac\u09be\u09a3\u09bf\u099c\u09cd\u09af\u09bf\u0995 \u098f\u09ac\u0982 \u09b6\u09bf\u09b2\u09cd\u09aa \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8\u0997\u09c1\u09b2\u09bf\u09a4\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09c3\u09a4 \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u09c7\u09b0 \u09aa\u09b0\u09bf\u09a6\u09b0\u09cd\u09b6\u09a8 \u098f\u09ac\u0982 \u09aa\u09cd\u09b0\u09a4\u09bf\u09b0\u09cb\u09a7\u09ae\u09c2\u09b2\u0995 \u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be \u09aa\u09cd\u09b0\u09a6\u09be\u09a8 \u0995\u09b0\u09c7\u0964.<\/p>\n<p>\u098f\u099f\u09bf AB 4 \u0995\u09c7 \u09a6\u09b0\u0995\u09be\u09b0\u09c0 \u0995\u09b0\u09c7 \u09a4\u09cb\u09b2\u09c7:<\/p>\n<ul>\n<li>\u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3 \u09aa\u09cd\u09b0\u09cb\u0997\u09cd\u09b0\u09be\u09ae<\/li>\n<li>\u09b8\u09c1\u09ac\u09bf\u09a7\u09be \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2<\/li>\n<li>\u09ac\u09be\u09a3\u09bf\u099c\u09cd\u09af\u09bf\u0995 \u098f\u09ac\u0982 \u09b6\u09bf\u09b2\u09cd\u09aa \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09a6\u09b0\u09cd\u09b6\u09a8 \u09aa\u09b0\u09bf\u0995\u09b2\u09cd\u09aa\u09a8\u09be<\/li>\n<\/ul>\n<h3>\u0985\u09a8\u09cd\u09af\u09be\u09a8\u09cd\u09af NEMA AB \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f<\/h3>\n<p>\u0985\u09a8\u09cd\u09af\u09be\u09a8\u09cd\u09af AB-\u09b8\u09bf\u09b0\u09bf\u099c \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f\u0993 \u09b0\u09af\u09bc\u09c7\u099b\u09c7, \u09af\u09be\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09b0\u09af\u09bc\u09c7\u099b\u09c7:<\/p>\n<ul>\n<li><strong>AB 3<\/strong> \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09a8\u09be\u09b0 \u099c\u09a8\u09cd\u09af<\/li>\n<li><strong>AB 4<\/strong> \u09aa\u09b0\u09bf\u09a6\u09b0\u09cd\u09b6\u09a8 \u098f\u09ac\u0982 \u09aa\u09cd\u09b0\u09a4\u09bf\u09b0\u09cb\u09a7\u09ae\u09c2\u09b2\u0995 \u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3\u09c7\u09b0 \u099c\u09a8\u09cd\u09af<\/li>\n<li><strong>AB 5<\/strong> \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09bf\u09b8\u09cd\u099f\u09c7\u09ae\u09c7 \u09a8\u09bf\u09b0\u09cd\u09ac\u09be\u099a\u09a8\u09c0 \u09b8\u09ae\u09a8\u09cd\u09ac\u09af\u09bc \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09a8\u09be\u09b0 \u099c\u09a8\u09cd\u09af<\/li>\n<\/ul>\n<p>\u09ae\u09c2\u09b2 \u09ac\u09bf\u09b7\u09af\u09bc \u09b9\u09b2 \u201cNEMA AB\u201d \u0995\u09c7 \u098f\u0995\u099f\u09bf \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09aa\u09a1\u09bc\u09be \u0989\u099a\u09bf\u09a4 <strong>\u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f\u09c7\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0<\/strong>, UL, NEC, \u09ac\u09be \u09ac\u09b0\u09cd\u09a4\u09ae\u09be\u09a8 \u0989\u09a4\u09cd\u09a4\u09b0 \u0986\u09ae\u09c7\u09b0\u09bf\u0995\u09be\u09b0 \u0985\u09a8\u09c1\u09b6\u09c0\u09b2\u09a8\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09c3\u09a4 \u09a4\u09cd\u09b0\u09bf\u09ae\u09c1\u0996\u09c0 \u09aa\u09a3\u09cd\u09af-\u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u0995\u09be\u09a0\u09be\u09ae\u09cb\u09b0 \u09aa\u09cd\u09b0\u09a4\u09bf\u09b8\u09cd\u09a5\u09be\u09aa\u09a8 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09a8\u09af\u09bc\u0964.<\/p>\n<h2>IEEE C37 \u0995\u09cb\u09a5\u09be\u09af\u09bc \u09ab\u09bf\u099f \u0995\u09b0\u09c7<\/h2>\n<p>\u09af\u09a6\u09bf NEMA AB \u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u09af\u09c1\u0995\u09cd\u09a4\u09b0\u09be\u09b7\u09cd\u099f\u09cd\u09b0\u09c7\u09b0 \u0987\u0995\u09cb\u09b8\u09bf\u09b8\u09cd\u099f\u09c7\u09ae\u09c7\u09b0 \u099b\u09be\u0981\u099a\u09af\u09c1\u0995\u09cd\u09a4-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0 \u09a6\u09bf\u0995 \u09b9\u09af\u09bc, <strong>IEEE C37 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09c7<\/strong> \u09a4\u09be\u09b9\u09b2\u09c7 \u098f\u099f\u09bf \u09aa\u09cd\u09b0\u09a7\u09be\u09a8 \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u098f\u09ac\u0982 \u09ae\u09be\u099d\u09be\u09b0\u09bf-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0 \u09a6\u09bf\u0995\u0964.<\/p>\n<p>\u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0986\u09b2\u09cb\u099a\u09a8\u09be\u09b0 \u099c\u09a8\u09cd\u09af, \u09b8\u09ac\u099a\u09c7\u09af\u09bc\u09c7 \u09aa\u09cd\u09b0\u09be\u09b8\u0999\u09cd\u0997\u09bf\u0995 C37 \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f\u0997\u09c1\u09b2\u09bf\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u0985\u09a8\u09cd\u09a4\u09b0\u09cd\u09ad\u09c1\u0995\u09cd\u09a4 \u09a5\u09be\u0995\u09c7:<\/p>\n<ul>\n<li><strong>IEEE C37.13<\/strong> \u0998\u09c7\u09b0\u09c7\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09c3\u09a4 \u09a8\u09bf\u09ae\u09cd\u09a8-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u098f\u09b8\u09bf 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\u09aa\u09cd\u09b0\u09af\u09cb\u099c\u09cd\u09af?<\/li>\n<li>\u0985\u09cd\u09af\u09be\u09b8\u09c7\u09ae\u09cd\u09ac\u09b2\u09bf \u09a8\u09c7\u09ae\u09aa\u09cd\u09b2\u09c7\u099f\u09c7 \u0995\u09c0 SCCR \u09ac\u09b9\u09a8 \u0995\u09b0\u09a4\u09c7 \u09b9\u09ac\u09c7?<\/li>\n<li>\u09ab\u09b2\u09cd\u099f \u09aa\u09b0\u09bf\u09b8\u09cd\u09a5\u09bf\u09a4\u09bf\u09a4\u09c7 \u0986\u09aa\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u09ae \u098f\u09ac\u0982 \u09a1\u09be\u0989\u09a8\u09b8\u09cd\u099f\u09cd\u09b0\u09bf\u09ae \u09a1\u09bf\u09ad\u09be\u0987\u09b8\u0997\u09c1\u09b2\u09bf \u0995\u09c0\u09ad\u09be\u09ac\u09c7 \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439 \u0995\u09b0\u09c7?<\/li>\n<\/ul>\n<p>\u098f\u0987 \u0995\u09be\u09b0\u09a3\u09c7 \u0987\u0989\u098f\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u0986\u09b2\u09cb\u099a\u09a8\u09be \u09b8\u09cd\u09ac\u09be\u09ad\u09be\u09ac\u09bf\u0995\u09ad\u09be\u09ac\u09c7\u0987 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09aa\u09c7\u099c\u0997\u09c1\u09b2\u09cb\u09b0 \u09b8\u09be\u09a5\u09c7 \u09af\u09c1\u0995\u09cd\u09a4 \u09b9\u09df, \u09af\u09c7\u09ae\u09a8 <a href=\"https:\/\/test.viox.com\/bn\/circuit-breaker-ratings-icu-ics-icw-icm\/\">\u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b0\u09c7\u099f\u09bf\u0982: Icu, Ics, Icw, \u098f\u09ac\u0982 Icm<\/a>, \u09af\u09a6\u09bf\u0993 IEC \u098f\u09ac\u0982 UL \u0985\u09a8\u09c1\u09b6\u09c0\u09b2\u09a8\u09c7 \u09a8\u09be\u09ae\u0995\u09b0\u09a3\u09c7\u09b0 \u09a8\u09bf\u09df\u09ae\u09be\u09ac\u09b2\u09c0 \u098f\u0995 \u09a8\u09df\u0964.<\/p>\n<h2>\u098f\u0987 \u09ac\u09bf\u09b7\u09af\u09bc\u09c7 NEC \u0995\u09cb\u09a5\u09be\u09af\u09bc \u09b8\u09ac\u099a\u09c7\u09af\u09bc\u09c7 \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3<\/h2>\n<p>\u09af\u0996\u09a8 \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0\u09b0\u09be UL 489, UL 1066, NEMA AB, \u098f\u09ac\u0982 NEC \u09a4\u09c1\u09b2\u09a8\u09be \u0995\u09b0\u09c7\u09a8, \u09a4\u0996\u09a8 NEC \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u098f\u0987 \u0995\u09cd\u09b7\u09c7\u09a4\u09cd\u09b0\u0997\u09c1\u09b2\u09bf\u09a4\u09c7 \u09b8\u09ac\u099a\u09c7\u09af\u09bc\u09c7 \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3:<\/p>\n<ul>\n<li>\u0993\u09ad\u09be\u09b0\u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09b8\u09c1\u09b0\u0995\u09cd\u09b7\u09be \u09ac\u09bf\u09a7\u09bf<\/li>\n<li>\u09b8\u09b0\u099e\u09cd\u099c\u09be\u09ae \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09b8\u09c0\u09ae\u09be<\/li>\n<li>\u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u09aa\u09a6\u09cd\u09a7\u09a4\u09bf<\/li>\n<li>\u09a4\u09be\u09b2\u09bf\u0995\u09be \u098f\u09ac\u0982 \u09b2\u09c7\u09ac\u09c7\u09b2\u09bf\u0982 \u09b8\u09ae\u09cd\u09ae\u09a4\u09bf<\/li>\n<li>\u09aa\u09cd\u09af\u09be\u09a8\u09c7\u09b2\u09ac\u09cb\u09b0\u09cd\u09a1, \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0, \u09ac\u09be \u09ae\u09cb\u099f\u09b0 \u09b8\u09bf\u09b8\u09cd\u099f\u09c7\u09ae\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09b8\u09ae\u09a8\u09cd\u09ac\u09af\u09bc<\/li>\n<\/ul>\n<p>\u0989\u09a6\u09be\u09b9\u09b0\u09a3\u09b8\u09cd\u09ac\u09b0\u09c2\u09aa, NEC \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09ac\u09bf\u09a7\u09bf\u0997\u09c1\u09b2\u09bf \u09ac\u09cd\u09af\u09be\u0996\u09cd\u09af\u09be \u0995\u09b0\u09a4\u09c7 \u09b8\u09be\u09b9\u09be\u09af\u09cd\u09af \u0995\u09b0\u09c7 \u0995\u09c7\u09a8 \u098f\u0995\u099f\u09bf \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09af\u09be \u098f\u0995\u099f\u09bf \u09b8\u09b0\u099e\u09cd\u099c\u09be\u09ae \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f\u09c7 \u09ac\u09c8\u09a7, \u09a4\u09be \u09b8\u09cd\u09ac\u09af\u09bc\u0982\u0995\u09cd\u09b0\u09bf\u09af\u09bc\u09ad\u09be\u09ac\u09c7 \u0985\u09a8\u09cd\u09af\u099f\u09bf\u09a4\u09c7 \u09ac\u09c8\u09a7 \u09ac\u09b2\u09c7 \u09a7\u09b0\u09c7 \u09a8\u09c7\u0993\u09af\u09bc\u09be \u09af\u09be\u09af\u09bc \u09a8\u09be\u0964.<\/p>\n<p>\u09af\u09a6\u09bf \u0986\u09aa\u09a8\u09be\u09b0 \u09ae\u09a8\u09cb\u09af\u09cb\u0997 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09b0\u09c7\u099f\u09bf\u0982 \u098f\u09ac\u0982 \u09b8\u09ae\u09a8\u09cd\u09ac\u09af\u09bc \u09ad\u09be\u09b7\u09be\u09b0 \u09a6\u09bf\u0995\u09c7 \u09a5\u09be\u0995\u09c7, <a href=\"https:\/\/test.viox.com\/bn\/circuit-breaker-ratings-icu-ics-icw-icm\/\">\u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b0\u09c7\u099f\u09bf\u0982: Icu, Ics, Icw, \u098f\u09ac\u0982 Icm<\/a> \u098f\u0995\u099f\u09bf \u09a6\u09b0\u0995\u09be\u09b0\u09c0 \u09aa\u09be\u09b0\u09cd\u09b6\u09cd\u09ac\u09ac\u09b0\u09cd\u09a4\u09c0 \u09aa\u09be\u09a0\u0964.<\/p>\n<h2>\u09b8\u09cd\u09aa\u09c7\u09b8\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u0995\u09be\u099c\u09c7 \u098f\u0987 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1\u0997\u09c1\u09b2\u09bf \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09c7\u09b0 \u098f\u0995\u099f\u09bf \u09ac\u09be\u09b8\u09cd\u09a4\u09ac\u09b8\u09ae\u09cd\u09ae\u09a4 \u0989\u09aa\u09be\u09af\u09bc<\/h2>\n<p>\u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u09ac\u09be\u099c\u09be\u09b0\u09c7 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09cd\u09aa\u09c7\u09b8\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u09b2\u09c7\u0996\u09be\u09b0 \u09ac\u09be \u09aa\u09b0\u09cd\u09af\u09be\u09b2\u09cb\u099a\u09a8\u09be \u0995\u09b0\u09be\u09b0 \u09b8\u09ae\u09af\u09bc, \u098f\u0995\u099f\u09bf \u09ac\u09be\u09b8\u09cd\u09a4\u09ac\u09b8\u09ae\u09cd\u09ae\u09a4 \u0987\u099e\u09cd\u099c\u09bf\u09a8\u09bf\u09af\u09bc\u09be\u09b0\u09bf\u0982 \u0995\u09b0\u09cd\u09ae\u09aa\u09cd\u09b0\u09ac\u09be\u09b9 \u09b9\u09b2:<\/p>\n<h3>\u09a7\u09be\u09aa \u09e7. \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0 \u09b8\u09a8\u09be\u0995\u09cd\u09a4 \u0995\u09b0\u09c1\u09a8<\/h3>\n<p>\u0986\u09aa\u09a8\u09bf \u0995\u09bf \u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u0995\u09b0\u099b\u09c7\u09a8:<\/p>\n<ul>\n<li>\u09aa\u09cd\u09af\u09be\u09a8\u09c7\u09b2 \u09ac\u09be \u09ab\u09bf\u09a1\u09be\u09b0 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u098f\u0995\u099f\u09bf \u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0<\/li>\n<li>\u0985\u09a5\u09ac\u09be \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0\u09c7\u09b0 \u099c\u09a8\u09cd\u09af \u098f\u0995\u099f\u09bf \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0<\/li>\n<\/ul>\n<p>\u09b8\u09c7\u0987 \u098f\u0995\u099f\u09bf \u09b8\u09bf\u09a6\u09cd\u09a7\u09be\u09a8\u09cd\u09a4 \u09aa\u09cd\u09b0\u09be\u09af\u09bc\u09b6\u0987 \u0986\u09aa\u09a8\u09be\u0995\u09c7 \u09b8\u09b0\u09be\u09b8\u09b0\u09bf UL 489 \u09ac\u09be UL 1066-\u098f\u09b0 \u09a6\u09bf\u0995\u09c7 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6 \u0995\u09b0\u09c7\u0964.<\/p>\n<h3>\u09a7\u09be\u09aa \u09e8. \u0985\u09cd\u09af\u09be\u09b8\u09c7\u09ae\u09cd\u09ac\u09b2\u09bf \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be \u0995\u09b0\u09c1\u09a8<\/h3>\n<p>\u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u099f\u09bf \u0995\u09cb\u09a5\u09be\u09df \u09af\u09be\u099a\u09cd\u099b\u09c7:<\/p>\n<ul>\n<li>\u09aa\u09cd\u09af\u09be\u09a8\u09c7\u09b2\u09ac\u09cb\u09b0\u09cd\u09a1 \u0986\u09a8\u09aa\u09cd\u09af\u09be\u0995 \u0995\u09b0\u09c7\u09a8<\/li>\n<li>\u09b8\u09c1\u0987\u099a\u09ac\u09cb\u09b0\u09cd\u09a1<\/li>\n<li>\u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0<\/li>\n<li>\u0995\u09be\u09b8\u09cd\u099f\u09ae \u09b6\u09bf\u09b2\u09cd\u09aa \u09b8\u09b0\u099e\u09cd\u099c\u09be\u09ae<\/li>\n<\/ul>\n<p>\u09b8\u09b0\u099e\u09cd\u099c\u09be\u09ae\u09c7\u09b0 \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u09c7\u09b0 \u09ae\u09a4\u09cb\u0987 \u0997\u09c1\u09b0\u09c1\u09a4\u09cd\u09ac\u09aa\u09c2\u09b0\u09cd\u09a3\u0964.<\/p>\n<h3>\u09a7\u09be\u09aa \u09e9. NEC \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u099c\u09a8\u09c0\u09af\u09bc\u09a4\u09be \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be \u0995\u09b0\u09c1\u09a8<\/h3>\n<p>\u098f\u09ae\u09a8\u0995\u09bf \u09b8\u09a0\u09bf\u0995\u09ad\u09be\u09ac\u09c7 \u09a4\u09be\u09b2\u09bf\u0995\u09be\u09ad\u09c1\u0995\u09cd\u09a4 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u0993 \u09ad\u09c1\u09b2\u09ad\u09be\u09ac\u09c7 \u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u0997 \u0995\u09b0\u09be \u09b9\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7 \u09af\u09a6\u09bf \u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u09a1\u09bf\u099c\u09be\u0987\u09a8 NEC \u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u099c\u09a8\u09c0\u09af\u09bc\u09a4\u09be\u09b0 \u09b8\u09be\u09a5\u09c7 \u09b8\u0999\u09cd\u0997\u09a4\u09bf\u09aa\u09c2\u09b0\u09cd\u09a3 \u09a8\u09be \u09b9\u09af\u09bc\u0964.<\/p>\n<h3>\u09a7\u09be\u09aa \u09ea. NEMA AB \u09a8\u09a5\u09bf\u0997\u09c1\u09b2\u09bf\u0995\u09c7 \u09b8\u09ae\u09b0\u09cd\u09a5\u09a8 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09cd\u09af\u09ac\u09b9\u09be\u09b0 \u0995\u09b0\u09c1\u09a8, \u0995\u09cb\u09a1\u09c7\u09b0 \u09ac\u09bf\u0995\u09b2\u09cd\u09aa \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09a8\u09af\u09bc<\/h3>\n<p>NEMA AB \u09a8\u09a5\u09bf\u0997\u09c1\u09b2\u09bf \u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09ac\u09cb\u099d\u09be, \u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3 \u098f\u09ac\u0982 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09ac\u09bf\u09b8\u09cd\u09a4\u09be\u09b0\u09bf\u09a4 \u099c\u09be\u09a8\u09be\u09b0 \u099c\u09a8\u09cd\u09af \u09ae\u09c2\u09b2\u09cd\u09af\u09ac\u09be\u09a8, \u09a4\u09ac\u09c7 \u09a4\u09be\u09b0\u09be NEC \u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u09ac\u09be\u09a7\u09cd\u09af\u09ac\u09be\u09a7\u0995\u09a4\u09be \u09aa\u09cd\u09b0\u09a4\u09bf\u09b8\u09cd\u09a5\u09be\u09aa\u09a8 \u0995\u09b0\u09c7 \u09a8\u09be\u0964.<\/p>\n<h3>\u09a7\u09be\u09aa \u09eb. \u09ab\u09b2\u09cd\u099f \u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u098f\u09ac\u0982 \u09b0\u09c7\u099f\u09bf\u0982 \u09aa\u09cd\u09b0\u09a4\u09cd\u09af\u09be\u09b6\u09be \u09a8\u09bf\u09b6\u09cd\u099a\u09bf\u09a4 \u0995\u09b0\u09c1\u09a8<\/h3>\n<p>\u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u09ac\u09be\u099c\u09be\u09b0\u09c7, \u098f\u09b0 \u09ae\u09be\u09a8\u09c7 \u09b9\u09b2 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u098f\u09ac\u0982 \u0985\u09cd\u09af\u09be\u09b8\u09c7\u09ae\u09cd\u09ac\u09b2\u09bf \u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u09aa\u09af\u09bc\u09c7\u09a8\u09cd\u099f\u09c7 \u0989\u09aa\u09b2\u09ac\u09cd\u09a7 \u09ab\u09b2\u09cd\u099f-\u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09aa\u09b0\u09bf\u09b8\u09cd\u09a5\u09bf\u09a4\u09bf, \u0987\u09a8\u09cd\u099f\u09be\u09b0\u09be\u09aa\u09cd\u099f\u09bf\u0982 \u09aa\u09cd\u09b0\u09af\u09bc\u09cb\u099c\u09a8\u09c0\u09af\u09bc\u09a4\u09be \u098f\u09ac\u0982 SCCR \u09aa\u09cd\u09b0\u09a4\u09cd\u09af\u09be\u09b6\u09be \u09b8\u09ae\u09b0\u09cd\u09a5\u09a8 \u0995\u09b0\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7 \u0995\u09bf\u09a8\u09be \u09a4\u09be \u09aa\u09b0\u09c0\u0995\u09cd\u09b7\u09be \u0995\u09b0\u09be\u0964.<\/p>\n<h3>\u09a7\u09be\u09aa \u09ec. \u099c\u09bf\u099c\u09cd\u099e\u09be\u09b8\u09be \u0995\u09b0\u09c1\u09a8 \u09aa\u09cd\u09b0\u0995\u09b2\u09cd\u09aa\u099f\u09bf \u09b6\u09c1\u09a7\u09c1\u09ae\u09be\u09a4\u09cd\u09b0 \u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8-\u09ad\u09bf\u09a4\u09cd\u09a4\u09bf\u0995 \u09a8\u09be\u0995\u09bf IEC-\u098f\u09b0 \u09b8\u09be\u09a5\u09c7\u0993 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09bf\u09a4<\/h3>\n<p>\u09af\u09a6\u09bf \u09aa\u09cd\u09b0\u0995\u09b2\u09cd\u09aa\u099f\u09bf \u0986\u09a8\u09cd\u09a4\u09b0\u09cd\u099c\u09be\u09a4\u09bf\u0995 \u09ac\u09be\u099c\u09be\u09b0\u09c7\u0993 \u09aa\u09b0\u09bf\u09b7\u09c7\u09ac\u09be \u09a6\u09c7\u09df, \u09a4\u09ac\u09c7 \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0\u09a6\u09c7\u09b0 \u09aa\u09cd\u09b0\u09be\u09af\u09bc\u09b6\u0987 \u09ac\u09c1\u099d\u09a4\u09c7 \u09b9\u09df \u0995\u09cb\u09a5\u09be\u09df <strong>IEC 60947-1<\/strong> \u098f\u09ac\u0982 <strong>\u0986\u0987\u0987\u09b8\u09bf 60947-2<\/strong> \u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u0995\u09be\u09a0\u09be\u09ae\u09cb\u09b0 \u09b8\u09be\u09aa\u09c7\u0995\u09cd\u09b7\u09c7 \u0985\u09ac\u09b8\u09cd\u09a5\u09bf\u09a4\u0964 \u098f\u0997\u09c1\u09b2\u09bf UL 489 \u09ac\u09be UL 1066-\u098f\u09b0 \u09b8\u09b0\u09be\u09b8\u09b0\u09bf \u0985\u09a8\u09c1\u09b2\u09bf\u09aa\u09bf \u09a8\u09af\u09bc, \u09a4\u09ac\u09c7 \u098f\u0997\u09c1\u09b2\u09bf \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0 \u098f\u09ac\u0982 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u09c7\u09b0 \u099c\u09a8\u09cd\u09af IEC-\u09b8\u09be\u0987\u09a1\u09c7\u09b0 \u09ae\u09c2\u09b2 \u09b0\u09c7\u09ab\u09be\u09b0\u09c7\u09a8\u09cd\u09b8 \u09aa\u09af\u09bc\u09c7\u09a8\u09cd\u099f\u0964.<\/p>\n<h2>\u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0 \u098f\u09ac\u0982 \u0995\u09cd\u09b0\u09c7\u09a4\u09be\u09b0\u09be \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u09af\u09c7 \u09ad\u09c1\u09b2\u0997\u09c1\u09b2\u09cb \u0995\u09b0\u09c7\u09a8<\/h2>\n<h3>UL 489 \u098f\u09ac\u0982 UL 1066 \u0995\u09c7 \u098f\u0995\u0987 \u09a1\u09bf\u09ad\u09be\u0987\u09b8 \u0995\u09cd\u09af\u09be\u099f\u09be\u0997\u09b0\u09bf \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09bf\u09ac\u09c7\u099a\u09a8\u09be \u0995\u09b0\u09be<\/h3>\n<p>\u09a4\u09be\u09b0\u09be \u09a4\u09be \u09a8\u09df\u0964 \u09a4\u09be\u09b0\u09be \u09ac\u09bf\u09ad\u09bf\u09a8\u09cd\u09a8 \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u0995\u09c7 \u0995\u09ad\u09be\u09b0 \u0995\u09b0\u09c7\u0964.<\/p>\n<h3>NEMA AB \u0995\u09c7 \u098f\u0995\u099f\u09bf \u09b8\u09cd\u09ac\u09a4\u09a8\u09cd\u09a4\u09cd\u09b0 \u0989\u09a4\u09cd\u09a4\u09b0 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09ac\u09bf\u09ac\u09c7\u099a\u09a8\u09be \u0995\u09b0\u09be<\/h3>\n<p>\u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u0986\u09b8\u09b2 \u09aa\u09cd\u09b0\u09b6\u09cd\u09a8 \u09b9\u09b2 \u0986\u09aa\u09a8\u09bf \u0995\u09cb\u09a8 AB \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f\u099f\u09bf \u09ac\u09cb\u099d\u09be\u09a4\u09c7 \u099a\u09c7\u09df\u09c7\u099b\u09c7\u09a8 \u098f\u09ac\u0982 \u0986\u09aa\u09a8\u09bf \u09aa\u09a3\u09cd\u09af \u09b8\u09ae\u09a4\u09c1\u09b2\u09cd\u09af\u09a4\u09be, \u09b0\u0995\u09cd\u09b7\u09a3\u09be\u09ac\u09c7\u0995\u09cd\u09b7\u09a3 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be, \u09ac\u09be \u098f\u0995\u099f\u09bf \u09a8\u09bf\u09b0\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09b8\u09ae\u09b8\u09cd\u09af\u09be \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09c7 \u0995\u09a5\u09be \u09ac\u09b2\u099b\u09c7\u09a8 \u0995\u09bf\u09a8\u09be\u0964.<\/p>\n<h3>NEC \u0995\u09c7 \u098f\u0995\u099f\u09bf \u09aa\u09a3\u09cd\u09af \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u09a7\u09b0\u09c7 \u09a8\u09c7\u0993\u09af\u09bc\u09be<\/h3>\n<p>\u098f\u099f\u09be \u09a4\u09be \u09a8\u09df\u0964 NEC \u09b9\u09b2 \u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u0995\u09cb\u09a1, \u09aa\u09a3\u09cd\u09af \u09b8\u09c1\u09b0\u0995\u09cd\u09b7\u09be \u09a4\u09be\u09b2\u09bf\u0995\u09be \u09a8\u09af\u09bc\u0964.<\/p>\n<h3>\u0989\u09aa\u09b2\u09ac\u09cd\u09a7 \u09ab\u09b2\u09cd\u099f \u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f, \u0987\u09a8\u09cd\u099f\u09be\u09b0\u09be\u09aa\u09cd\u099f\u09bf\u0982 \u09b0\u09c7\u099f\u09bf\u0982, \u09ac\u09be SCCR \u0989\u09aa\u09c7\u0995\u09cd\u09b7\u09be \u0995\u09b0\u09be<\/h3>\n<p>\u098f\u099f\u09bf \u201c\u09b8\u09ae\u09cd\u09ae\u09a4\u09bf\u09aa\u09c2\u09b0\u09cd\u09a3\u201d \u09b8\u09cd\u09aa\u09c7\u09b8\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8\u0995\u09c7 \u09ab\u09bf\u09b2\u09cd\u09a1 \u09b8\u09ae\u09b8\u09cd\u09af\u09be\u09af\u09bc \u09aa\u09b0\u09bf\u09a3\u09a4 \u0995\u09b0\u09be\u09b0 \u09a6\u09cd\u09b0\u09c1\u09a4\u09a4\u09ae \u0989\u09aa\u09be\u09af\u09bc\u0997\u09c1\u09b2\u09bf\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u098f\u0995\u099f\u09bf\u0964.<\/p>\n<blockquote><p><strong>\u09ac\u09bf\u09b6\u09c7\u09b7\u099c\u09cd\u099e \u09ab\u09bf\u09b2\u09cd\u09a1 \u09a8\u09cb\u099f:<\/strong> \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b0\u09c7\u099f\u09cd\u09b0\u09cb\u09ab\u09bf\u099f \u09aa\u09b0\u09cd\u09af\u09be\u09b2\u09cb\u099a\u09a8\u09be\u09df, \u09b8\u09ac\u099a\u09c7\u09af\u09bc\u09c7 \u09b8\u09be\u09a7\u09be\u09b0\u09a3 \u09b8\u09cd\u09aa\u09c7\u09b8\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u09ad\u09c1\u09b2\u0997\u09c1\u09b2\u09bf\u09b0 \u09ae\u09a7\u09cd\u09af\u09c7 \u098f\u0995\u099f\u09bf \u09b9\u09b2 \u09b6\u09c1\u09a7\u09c1\u09ae\u09be\u09a4\u09cd\u09b0 \u0985\u09cd\u09af\u09be\u09ae\u09cd\u09aa\u09bf\u09af\u09bc\u09be\u09b0 \u09b0\u09c7\u099f\u09bf\u0982 \u098f\u09ac\u0982 \u09ab\u09cd\u09b0\u09c7\u09ae \u09b8\u09be\u0987\u099c\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09ae\u09c7\u09b2\u09be\u09a8\u09cb, \u0985\u09cd\u09af\u09be\u09b8\u09c7\u09ae\u09cd\u09ac\u09b2\u09bf\u09b0 \u09ab\u09b2\u09cd\u099f-\u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f\u0995\u09c7 \u0989\u09aa\u09c7\u0995\u09cd\u09b7\u09be \u0995\u09b0\u09be\u0964 \u0995\u09be\u0997\u099c\u09c7 \u0995\u09b2\u09ae\u09c7 \u09aa\u09cd\u09b0\u09a4\u09bf\u09b8\u09cd\u09a5\u09be\u09aa\u09a8 \u09b8\u09ae\u09a4\u09c1\u09b2\u09cd\u09af \u09a6\u09c7\u0996\u09a4\u09c7 \u09b2\u09be\u0997\u09a4\u09c7 \u09aa\u09be\u09b0\u09c7\u0964 \u09ab\u09bf\u09b2\u09cd\u09a1\u09c7, \u09b8\u09ae\u09b8\u09cd\u09af\u09be\u099f\u09bf \u09a6\u09c7\u0996\u09be \u09a6\u09c7\u09af\u09bc \u09af\u0996\u09a8 \u09b8\u09c1\u0987\u099a\u09ac\u09cb\u09b0\u09cd\u09a1 \u09ac\u09be \u09aa\u09cd\u09af\u09be\u09a8\u09c7\u09b2\u09c7\u09b0 SCCR \u0989\u09aa\u09b2\u09ac\u09cd\u09a7 \u09ab\u09b2\u09cd\u099f \u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09ac\u09be \u0989\u09a6\u09cd\u09a6\u09bf\u09b7\u09cd\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0\u09c7\u09b0 \u09b8\u09be\u09a5\u09c7 \u09aa\u09b0\u09bf\u09b7\u09cd\u0995\u09be\u09b0\u09ad\u09be\u09ac\u09c7 \u09ae\u09c7\u09b2\u09c7 \u09a8\u09be\u0964.<\/p><\/blockquote>\n<h3>\u09b6\u09c1\u09a7\u09c1\u09ae\u09be\u09a4\u09cd\u09b0 \u0995\u09be\u09b0\u09c7\u09a8\u09cd\u099f \u09b0\u09c7\u099f\u09bf\u0982 \u09a6\u09cd\u09ac\u09be\u09b0\u09be \u09a8\u09bf\u09b0\u09cd\u09ac\u09be\u099a\u09a8 \u0995\u09b0\u09be<\/h3>\n<p>\u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u0985\u09a8\u09c1\u09b6\u09c0\u09b2\u09a8\u09c7, \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0, \u0985\u09cd\u09af\u09be\u09b8\u09c7\u09ae\u09cd\u09ac\u09b2\u09bf \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f, \u09a4\u09be\u09b2\u09bf\u0995\u09be\u09ad\u09c1\u0995\u09cd\u09a4\u09bf\u09b0 \u09aa\u09a5 \u098f\u09ac\u0982 \u0995\u09cb\u09a1 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09b8\u09ac\u0987 \u09b8\u09bf\u09a6\u09cd\u09a7\u09be\u09a8\u09cd\u09a4\u09c7\u09b0 \u0985\u0982\u09b6, \u09b6\u09c1\u09a7\u09c1 \u0985\u09cd\u09af\u09be\u09ae\u09cd\u09aa\u09bf\u09af\u09bc\u09be\u09b0 \u09a8\u09af\u09bc\u0964.<\/p>\n<h3>\u09a7\u09b0\u09c7 \u09a8\u09c7\u0993\u09af\u09bc\u09be \u09aa\u09cd\u09b0\u09a4\u09bf\u099f\u09bf \u201cUL \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0\u201d \u09aa\u09cd\u09b0\u09b6\u09cd\u09a8 UL \u098f \u09a5\u09c7\u09ae\u09c7 \u09af\u09be\u09af\u09bc<\/h3>\n<p>\u0985\u09a8\u09c7\u0995 \u09ac\u09be\u09b8\u09cd\u09a4\u09ac \u09aa\u09cd\u09b0\u0995\u09b2\u09cd\u09aa\u09c7, \u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u0989\u09a4\u09cd\u09a4\u09b0\u09c7 NEC \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u09ac\u09bf\u09a7\u09bf, NEMA \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be, IEEE C37 \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f \u098f\u09ac\u0982 \u0995\u0996\u09a8\u0993 \u0995\u0996\u09a8\u0993 \u09b8\u09be\u09b0\u09cd\u099f\u09bf\u09ab\u09bf\u0995\u09c7\u09b6\u09a8 \u0997\u09cd\u09b0\u09b9\u09a3\u09c7\u09b0 \u09aa\u09bf\u099b\u09a8\u09c7 OSHA NRTL \u09b8\u09cd\u09ac\u09c0\u0995\u09c3\u09a4\u09bf \u0995\u09be\u09a0\u09be\u09ae\u09cb \u099c\u09a1\u09bc\u09bf\u09a4\u0964.<\/p>\n<h2>\u09b8\u099a\u09b0\u09be\u099a\u09b0 \u099c\u09bf\u099c\u09cd\u099e\u09be\u09b8\u09cd\u09af<\/h2>\n<h3>Is UL 489 the same as UL 1066?<\/h3>\n<p>No. UL 489 applies to the molded-case breaker family, while UL 1066 applies to low-voltage power circuit breakers used in enclosures.<\/p>\n<h3>Is NEMA AB 1 different from UL 489?<\/h3>\n<p>\u0990\u09a4\u09bf\u09b9\u09be\u09b8\u09bf\u0995\u09ad\u09be\u09ac\u09c7, \u09a4\u09be\u09b0\u09be \u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09cd\u09b0\u09c7\u0995\u09cd\u09b7\u09be\u09aa\u099f\u09c7 \u0998\u09a8\u09bf\u09b7\u09cd\u09a0\u09ad\u09be\u09ac\u09c7 \u09b8\u09be\u09b0\u09bf\u09ac\u09a6\u09cd\u09a7 \u099b\u09bf\u09b2\u0964 \u09ac\u09b0\u09cd\u09a4\u09ae\u09be\u09a8 \u0989\u09a4\u09cd\u09a4\u09b0 \u0986\u09ae\u09c7\u09b0\u09bf\u0995\u09be\u09b0 \u0985\u09a8\u09c1\u09b6\u09c0\u09b2\u09a8\u09c7, \u09aa\u09cd\u09b0\u0995\u09cc\u09b6\u09b2\u09c0\u09b0\u09be \u09b8\u09be\u09a7\u09be\u09b0\u09a3\u09a4 \u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09aa\u09a3\u09cd\u09af \u0995\u09be\u09a0\u09be\u09ae\u09cb\u099f\u09bf\u0995\u09c7 \u09a4\u09cd\u09b0\u09df\u09c0-\u09a6\u09c7\u09b6\u09c0\u09af\u09bc \u09b8\u09be\u09b0\u09bf\u09ac\u09a6\u09cd\u09a7\u09a4\u09be\u09b0 \u09ae\u09be\u09a7\u09cd\u09af\u09ae\u09c7 \u09ac\u09cb\u099d\u09c7\u09a8 <strong>UL 489 \/ CSA C22.2 No. 5 \/ NMX-J-266-ANCE<\/strong>, \u09af\u09c7\u0996\u09be\u09a8\u09c7 AB 1 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1\u09c7\u09b0 \u0987\u09a4\u09bf\u09b9\u09be\u09b8 \u098f\u09ac\u0982 \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f-\u09ab\u09cd\u09af\u09be\u09ae\u09bf\u09b2\u09bf \u09ac\u0982\u09b6\u09c7\u09b0 \u0985\u0982\u09b6 \u09b9\u09bf\u09b8\u09be\u09ac\u09c7 \u0986\u09b0\u0993 \u09ac\u09c7\u09b6\u09bf \u0989\u09aa\u09af\u09cb\u0997\u09c0\u0964.<\/p>\n<h3>Does the NEC replace UL standards for circuit breakers?<\/h3>\n<p>No. The NEC governs installation and application. UL standards govern product safety and certification categories.<\/p>\n<h3>Which standard is more relevant for MCCBs?<\/h3>\n<p>In US low-voltage practice, molded-case circuit breakers are primarily associated with the UL 489 \/ NEMA AB 1 side of the framework.<\/p>\n<h3>Which standard is more relevant for low-voltage power breakers in switchgear?<\/h3>\n<p>That is where UL 1066 becomes the more relevant product standard framework.<\/p>\n<h3>What is the relationship between ANSI, IEEE, NEMA, UL, and NEC?<\/h3>\n<p>ANSI is the coordination and approval layer for American National Standards. IEEE and NEMA are standards-development paths. UL is associated with product standards and product certification activity. NFPA publishes the NEC, and the NEC governs installation and application rather than product listing.<\/p>\n<h2>\u099a\u09c2\u09a1\u09bc\u09be\u09a8\u09cd\u09a4 \u09b8\u09c1\u09aa\u09be\u09b0\u09bf\u09b6<\/h2>\n<p>\u0986\u09aa\u09a8\u09bf \u09af\u09a6\u09bf \u098f\u0987 \u09a8\u09bf\u09ac\u09a8\u09cd\u09a7 \u09a5\u09c7\u0995\u09c7 \u09b6\u09c1\u09a7\u09c1\u09ae\u09be\u09a4\u09cd\u09b0 \u098f\u0995\u099f\u09bf \u099c\u09bf\u09a8\u09bf\u09b8 \u09ae\u09a8\u09c7 \u09b0\u09be\u0996\u09c7\u09a8, \u09a4\u09ac\u09c7 \u09a4\u09be \u09b9\u09b2:<\/p>\n<ul>\n<li><strong>\u0987\u0989\u098f\u09b2 \u09ea\u09ee\u09ef<\/strong> = \u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u099c\u0997\u09ce<\/li>\n<li><strong>UL 1066<\/strong> = \u09b2\u09cb-\u09ad\u09cb\u09b2\u09cd\u099f\u09c7\u099c \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u099c\u0997\u09ce<\/li>\n<li><strong>NEMA AB<\/strong> = \u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1-\u0995\u09c7\u09b8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09a1\u0995\u09c1\u09ae\u09c7\u09a8\u09cd\u099f \u09aa\u09b0\u09bf\u09ac\u09be\u09b0<\/li>\n<li><strong>IEEE C37 \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09c7<\/strong> = \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09b8\u09c1\u0987\u099a\u0997\u09bf\u09af\u09bc\u09be\u09b0 \u098f\u09ac\u0982 \u09aa\u09be\u0993\u09af\u09bc\u09be\u09b0 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09b8\u09cd\u099f\u09cd\u09af\u09be\u09a8\u09cd\u09a1\u09be\u09b0\u09cd\u09a1 \u09aa\u09b0\u09bf\u09ac\u09be\u09b0<\/li>\n<li><strong>\u098f\u09a8\u0987\u09b8\u09bf<\/strong> = \u0987\u09a8\u09b8\u09cd\u099f\u09b2\u09c7\u09b6\u09a8 \u098f\u09ac\u0982 \u0985\u09cd\u09af\u09be\u09aa\u09cd\u09b2\u09bf\u0995\u09c7\u09b6\u09a8 \u0995\u09cb\u09a1<\/li>\n<\/ul>\n<p>\u098f\u0995\u09ac\u09be\u09b0 \u098f\u0987 \u09ad\u09c2\u09ae\u09bf\u0995\u09be\u0997\u09c1\u09b2\u09bf \u09b8\u09cd\u09aa\u09b7\u09cd\u099f\u09ad\u09be\u09ac\u09c7 \u0986\u09b2\u09be\u09a6\u09be \u0995\u09b0\u09be \u09b9\u09b2\u09c7, \u09ae\u09be\u09b0\u09cd\u0995\u09bf\u09a8 \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 \u09a8\u09bf\u09b0\u09cd\u09ac\u09be\u099a\u09a8 \u09ac\u09cd\u09af\u09be\u0996\u09cd\u09af\u09be \u0995\u09b0\u09be \u0985\u09a8\u09c7\u0995 \u09b8\u09b9\u099c \u09b9\u09af\u09bc\u09c7 \u09af\u09be\u09af\u09bc\u0964.<\/p>\n<p>\u09b8\u0982\u09b2\u0997\u09cd\u09a8 \u09ac\u09bf\u09b7\u09af\u09bc\u0997\u09c1\u09b2\u09bf\u09b0 \u099c\u09a8\u09cd\u09af, \u099a\u09be\u09b2\u09bf\u09af\u09bc\u09c7 \u09af\u09be\u09a8:<\/p>\n<ul>\n<li><a href=\"https:\/\/test.viox.com\/bn\/mccb\/\">MCCB<\/a><\/li>\n<li><a href=\"https:\/\/test.viox.com\/bn\/acb\/\">\u098f\u09b8\u09bf\u09ac\u09bf<\/a><\/li>\n<li><a href=\"https:\/\/test.viox.com\/bn\/full-guide-to-molded-case-circuit-breakers-mccbs\/\">\u09ae\u09cb\u09b2\u09cd\u09a1\u09c7\u09a1 \u0995\u09c7\u09b8 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 (MCCB) \u09b8\u09ae\u09cd\u09aa\u09b0\u09cd\u0995\u09c7 \u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be<\/a><\/li>\n<li><a href=\"https:\/\/test.viox.com\/bn\/complete-guide-to-air-circuit-breakers-acb\/\">\u098f\u09af\u09bc\u09be\u09b0 \u09b8\u09be\u09b0\u09cd\u0995\u09bf\u099f \u09ac\u09cd\u09b0\u09c7\u0995\u09be\u09b0 (ACB) \u098f\u09b0 \u09b8\u09ae\u09cd\u09aa\u09c2\u09b0\u09cd\u09a3 \u09a8\u09bf\u09b0\u09cd\u09a6\u09c7\u09b6\u09bf\u0995\u09be<\/a><\/li>\n<\/ul>\n<\/div>\n<div class=\"simg-pop-btn\" style=\"top: 94.875px; left: 14px; display: none;\"><\/div>\n<div class=\"simg-pop-btn\" style=\"top: 94.875px; left: 14px; display: none;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>An engineer reviewing US low-voltage circuit breaker standards and documentation in a switchgear facility. If you work with low-voltage circuit breakers in the United States, the hardest part is often not the breaker itself. It is figuring out who does what in the standards system. People see names like: ANSI IEEE NEMA UL NFPA UL [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":23339,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-23338","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/posts\/23338","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/comments?post=23338"}],"version-history":[{"count":1,"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/posts\/23338\/revisions"}],"predecessor-version":[{"id":23340,"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/posts\/23338\/revisions\/23340"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/media\/23339"}],"wp:attachment":[{"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/media?parent=23338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/categories?post=23338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/test.viox.com\/bn\/wp-json\/wp\/v2\/tags?post=23338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}