{"id":41913,"date":"2023-08-10T16:14:26","date_gmt":"2023-08-10T15:14:26","guid":{"rendered":"https:\/\/www.gt-engineering.it\/?post_type=approfondimento&#038;p=41913"},"modified":"2023-08-22T08:22:47","modified_gmt":"2023-08-22T07:22:47","slug":"auxiliary-contactors","status":"publish","type":"approfondimento","link":"https:\/\/www.gt-engineering.it\/en\/insights\/electrical-hazard-and-arc-flash-mitigation\/contactors-used-in-safety-applications\/auxiliary-contactors\/","title":{"rendered":"Auxiliary 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 also called <strong>Auxiliary Relays or Contactor-relays<\/strong> and are used in the control part of the electrical equipment of Machinery.<\/p>\n<p>They have two parts only:<\/p>\n<ul>\n<li><strong>The control part:<\/strong> it is the coil that moves the auxiliary contacts. The terminals are indicated as A1 and A2.<\/li>\n<li><strong>The Auxiliary contacts:<\/strong> some are normally open and some are normally closed.<\/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-5-4-150x150.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=\"125\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-5-4-300x125.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 586px)\"\r\n                                width=\"586\"\r\n                                height=\"245\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-5-4.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 586px)\"\r\n                                width=\"586\"\r\n                                height=\"245\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-5-4.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-5-4.png.webp\"\r\n                                                        title=\"Capture 5\"\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 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>Figure 4.28 {4.12.2.2.2} shows a schematic of the contactor. The auxiliary contacts are shown when the coil is de-energised. That means:<\/p>\n<ul>\n<li><strong>Normally open<\/strong> contacts means that when the coil is de-energised, the contacts are open. They are normally indicated as 13, 14, 43, 44.<\/li>\n<li><strong>Normally closed<\/strong> contacts means that when the coil is de-energised, the contacts are closed. They are normally indicated as 21, 22, 31, 32.<\/li>\n<\/ul>\n<p>When the auxiliary contacts are indicated as Mechanically linked, it means that it is not possible that a NO contact has the same position of and NC one. They are designed according to <strong>IEC 60947-5-1<\/strong> [32] <strong>Annex L<\/strong>.<\/p>\n<blockquote><p><strong><em>[IEC 60947-5-1] Annex L: Special requirements for mechanically linked contact elements<\/em><\/strong><\/p>\n<p><strong><em>L.2.1 mechanically linked contact elements.<\/em><\/strong><em> Combination of n Make contact element(s) and m Break contact element(s) designed in such a way that they cannot be in closed position simultaneously under conditions defined in L.8.4.<\/em><\/p>\n<p><em>Note 1 to entry: One control circuit device may have more than one group of mechanically linked contact elements<\/em><\/p><\/blockquote>\n<p>The mechanical linkage shall be identified in circuit diagrams by a double parallel line connecting a filled circle on each of the mechanically linked contact symbols.<\/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\/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-6-4-150x150.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=\"77\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-6-4-300x77.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 626px)\"\r\n                                width=\"626\"\r\n                                height=\"161\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-6-4.png.webp\"\r\n                                type=\"image\/webp\"\r\n                            \/>\r\n                                                                                <source\r\n                                media=\"(max-width: 626px)\"\r\n                                width=\"626\"\r\n                                height=\"161\"\r\n                                srcset=\"https:\/\/www.gt-engineering.it\/wp-content\/uploads\/2023\/08\/Capture-6-4.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-6-4.png.webp\"\r\n                                                        title=\"Capture 6\"\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 also called Auxiliary Relays or Contactor-relays and are used in the control part of the electrical equipment of Machinery.<\/p>\n","protected":false},"author":182,"featured_media":41920,"parent":41895,"menu_order":1,"template":"","meta":{"_acf_changed":false,"footnotes":""},"tipologia_approfondimento":[51],"class_list":["post-41913","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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