{"id":41901,"date":"2023-08-10T16:08:18","date_gmt":"2023-08-10T15:08:18","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=approfondimento&#038;p=41901"},"modified":"2023-08-22T08:02:31","modified_gmt":"2023-08-22T07:02:31","slug":"power-contactors","status":"publish","type":"approfondimento","link":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/contactors-used-in-safety-applications\/power-contactors\/","title":{"rendered":"Power Contactors"},"content":{"rendered":"\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:flex-row\">\n\n    \n\n                    <div \n                class=\"order-1 relative w-full md:w-3\/4\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9 md:pr-12 xl:pr-24\"\n                >\n                    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>They are used as motor controllers in Branch Circuits.<\/p>\n<p>They have three parts:<\/p>\n<ul>\n<li><strong>The control part:<\/strong> it is the coil that moves both the power and the auxiliary contacts. The terminals are indicated as A1 and A2. When the coil is energised, the power contacts close.<\/li>\n<li><strong>The Power contacts:<\/strong> normally there are 3 input and 3 output terminals, numbered from 1 to 6. Those are used for the power lines L1, L2 and L3<\/li>\n<li><strong>The Auxiliary contacts:<\/strong> they indicate the status of the power contacts. Those contacts are called <strong>Mirror contacts<\/strong> and they are designed according to <strong>IEC 60947-4-1<\/strong> [34] <strong>Annex F<\/strong>.<\/li>\n<\/ul>\n<\/div>                <\/div>\n            <\/div>\n        \n                    <div\n                class=\"h-auto order-2 mb-8 md:mb-0   overflow-hidden shadow-content-image w-full md:w-1\/2\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 150px)\"\r\n                                width=\"150\"\r\n                                height=\"150\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-2-6-150x150.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 300px)\"\r\n                                width=\"300\"\r\n                                height=\"121\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-2-6-300x121.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 572px)\"\r\n                                width=\"572\"\r\n                                height=\"231\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-2-6.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 572px)\"\r\n                                width=\"572\"\r\n                                height=\"231\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-2-6.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full mx-auto\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-2-6.png.webp\"\r\n                                                        title=\"Capture 2\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n    <\/div>\n        <\/section>\n\n    \n\n\n\n\n    \n        <section\n            data-name=\"Contenuto testuale con immagine\"\n            class=\"bow-gte-testo-media u-spacer-base\"\n            id=\"\"\n        >\n            \n<div class=\"o-text-media px-side-spacer sm:px-side-spacer-sm lg:px-side-spacer-tablet 2xl:px-side-spacer-desktop flex flex-wrap items-start md:flex-row\">\n\n    \n\n                    <div \n                class=\"order-1 relative w-full\"\n            >\n                <div\n                    class=\"pt-6 space-y-6 w-full md:pt-0 md:space-y-4 lg:space-y-8 xl:space-y-9 md:pr-12 xl:pr-24\"\n                >\n                    \n<div class=\"a-text font-text text-base normal mt-8 first:mt-0 space-y-4\">\n    <p>The Mirror contacts have the characteristics of being guaranteed that <strong>if the power contacts are all in the open position, the Mirror contacts are closed<\/strong>.<\/p>\n<blockquote><p><strong><em>[IEC 60947-4-1] Annex F: Requirements for auxiliary contact linked with power contact (mirror contact)<\/em><\/strong><\/p>\n<p><strong><em>F.2.1 mirror contact<\/em><\/strong><em>. Normally closed auxiliary contact which cannot be in closed position simultaneously with the normally open main contact under conditions defined in Clause F.7 \u00a0<\/em><\/p>\n<p><em>NOTE One contactor may have more than one mirror contact.<\/em><\/p><\/blockquote>\n<p>The symbol of a mirror contact is hereafter<\/p>\n<\/div>                <\/div>\n            <\/div>\n        \n                    <div\n                class=\"h-auto order-2 mb-8 md:mb-0   overflow-hidden shadow-content-image w-full md:w-1\/4\"\n            >\n                \r\n\r\n    \r\n        \r\n            \r\n                \r\n                    <picture\r\n                        class=\"\"\r\n                                            >\r\n                                                                                                        <source\r\n                                media=\"(max-width: 97px)\"\r\n                                width=\"97\"\r\n                                height=\"99\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-4-4.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 97px)\"\r\n                                width=\"97\"\r\n                                height=\"99\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-4-4.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 97px)\"\r\n                                width=\"97\"\r\n                                height=\"99\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-4-4.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 97px)\"\r\n                                width=\"97\"\r\n                                height=\"99\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-4-4.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                            <img\r\n                            class=\"a-image transparent border-image h-auto  w-full mx-auto\"\r\n                                                        srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-4-4.png.webp\"\r\n                                                        title=\"Capture 4\"\r\n                                                        type=\"image\/webp\"\r\n                        \/>\r\n                    <\/picture>\r\n\r\n                \r\n\r\n                    \r\n    \r\n            <\/div>\n        \n    <\/div>\n        <\/section>\n\n    \n","protected":false},"excerpt":{"rendered":"<p>They are used as motor controllers in Branch Circuits.<\/p>\n","protected":false},"author":182,"featured_media":41908,"parent":41895,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tipologia_approfondimento":[51],"class_list":["post-41901","approfondimento","type-approfondimento","status-publish","has-post-thumbnail","hentry","tipologia_approfondimento-electrical-hazard-and-arc-flash-mitigation"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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