{"id":10483,"date":"2022-03-04T14:54:25","date_gmt":"2022-03-04T14:54:25","guid":{"rendered":"http:\/\/ardetem-sfere.com\/?post_type=product&#038;p=10483"},"modified":"2026-09-10T15:07:59","modified_gmt":"2026-09-10T13:07:59","slug":"differential-relays-type-b-elr21-31","status":"publish","type":"product","link":"https:\/\/ardetem-sfere.com\/en\/produit\/differential-relays-type-b-elr21-31\/","title":{"rendered":"Differential Relays \/ TYPE B ELR21-31"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<h5><span style=\"color: #ff0000;\"><a href=\"https:\/\/ardetem-sfere.com\/en\/produit\/differential-relays-type-b-elrv21-31\/\" style=\"color: #ff0000;\"><b><span lang=\"EN-GB\">REPLACED BY THE NEW MODELS ELRv21-31 | ELRv21-31 SFERE !!!<\/span><\/b><\/a><\/span><\/h5>\n<p><strong>The differential relays ELR21-31 are designed for limitation of the earth leakage <em>current of the type B<\/em>. <\/strong><\/p>\n<p>Associated with a measure earth leakage transformer and circuit breaker they allow to perform on low voltage networks of the type TT, IT, TNS the following functions:<\/p>\n<ul>\n<li><strong>Protection from direct contacts<\/strong><\/li>\n<li><strong>Complementary protection from indirect contacts<\/strong><\/li>\n<li><strong>Limitation of the leak current<\/strong><\/li>\n<li><strong>Protection from fires<\/strong><\/li>\n<\/ul>\n<p>Their reinforced immunity and TRMS measurement technique guarantee maximum safety and continuity of the electrical operation, avoiding ill-time cuts.<\/p>\n<p><em><strong><u>TECHNICAL SPECIFICATIONS<\/u><\/strong><\/em><\/p>\n<ul>\n<li>Permanent display of the instant leak current<\/li>\n<li>Display of the latching current<\/li>\n<li>Programmable sensitiveness: 30 mA to 3 A<\/li>\n<li>2 alarm and pre-alarm relay outputs<br \/>\n<strong><\/strong><\/li>\n<li><strong>Re-triggering cycle programmable (ELR31 Model)<br \/>\n<\/strong><\/li>\n<li>Test and reset the alarms from the keyboard or via external command<\/li>\n<li>Test of the connection with the earth leakage transformer<\/li>\n<li>Galvanic isolation: 2KV<\/li>\n<li>For DIN rail mounting<\/li>\n<li>Power supply: 20 to 270 vac and 20 to 300 vdc<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"http:\/\/ardetem-sfere.com\/wp-content\/uploads\/2021\/08\/ce.jpg\" alt=\"\" width=\"68\" height=\"68\" class=\"alignnone size-full wp-image-9696\" style=\"font-size: 1rem;\" srcset=\"https:\/\/ardetem-sfere.com\/wp-content\/uploads\/2021\/08\/ce.jpg 68w, https:\/\/ardetem-sfere.com\/wp-content\/uploads\/2021\/08\/ce-64x64.jpg 64w\" sizes=\"(max-width: 68px) 100vw, 68px\" \/><\/p>\n<p><strong><a href=\"http:\/\/ardetem-sfere.com\/download\/10475\/\">DATASHEET (pdf) <img decoding=\"async\" src=\"http:\/\/ardetem-sfere.com\/wp-content\/uploads\/2022\/01\/logo-pdf.jpg\" alt=\"\" width=\"24\" height=\"24\" class=\"alignnone size-full wp-image-9976\" \/><\/a> | <a href=\"http:\/\/ardetem-sfere.com\/download\/10472\/\">MANUAL (pdf) <img decoding=\"async\" src=\"http:\/\/ardetem-sfere.com\/wp-content\/uploads\/2022\/01\/logo-pdf.jpg\" alt=\"\" width=\"24\" height=\"24\" class=\"alignnone size-full wp-image-9976\" \/> <\/a>|<\/strong><\/p>\n","protected":false},"featured_media":39868,"template":"","meta":{"rs_blank_template":"","rs_page_bg_color":"","slide_template_v7":""},"product_brand":[641],"product_cat":[96],"product_tag":[],"class_list":["post-10483","product","type-product","status-publish","has-post-thumbnail","product_brand-ardetem","product_cat-differential-relays","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/product\/10483","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/media\/39868"}],"wp:attachment":[{"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/media?parent=10483"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/product_brand?post=10483"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/product_cat?post=10483"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/ardetem-sfere.com\/en\/wp-json\/wp\/v2\/product_tag?post=10483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}