{"id":3643,"date":"2026-08-21T07:01:37","date_gmt":"2026-08-21T07:01:37","guid":{"rendered":"https:\/\/acrel.pl\/?post_type=product&#038;p=3643"},"modified":"2026-08-21T07:18:08","modified_gmt":"2026-08-21T07:18:08","slug":"acrel-alp220-ef-low-voltage-earth-fault-relay","status":"publish","type":"product","link":"https:\/\/acrel.pl\/pl\/product\/acrel-alp220-ef-low-voltage-earth-fault-relay\/","title":{"rendered":"Acrel\u00a0ALP220-EF Low-voltage Earth Fault Relay"},"content":{"rendered":"<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph {\"style\":{\"typography\":{\"textAlign\":\"center\"}},\"fontSize\":\"large\"} -->\n<p class=\"has-text-align-center has-large-font-size\"><strong>General<\/strong><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph {\"style\":{\"typography\":{\"textAlign\":\"center\"}},\"fontSize\":\"medium\"} -->\n<p class=\"has-text-align-center has-medium-font-size\">Acrel&nbsp;ALP220-EF&nbsp;Earth&nbsp;Fault&nbsp;Overcurrent&nbsp;Relay is designed for low-voltage applications (up to 380 V) where it is necessary to monitor the system's ground current and provide protection when the ground current exceeds the permissible limit. This relay features&nbsp;&nbsp;an&nbsp;&nbsp;LCD&nbsp;&nbsp;display,&nbsp;&nbsp;Modbus-RTU&nbsp;&nbsp;communication&nbsp;&nbsp;capability,&nbsp;&nbsp;system&nbsp;&nbsp;current&nbsp;&nbsp;measurement,&nbsp;&nbsp;three-phase&nbsp;&nbsp;current overcurrent&nbsp;&nbsp;protection, &nbsp;ground&nbsp;&nbsp;current&nbsp;&nbsp;overcurrent&nbsp;&nbsp;protection, &nbsp;residual&nbsp;&nbsp;current&nbsp;&nbsp;measurement, &nbsp;residual&nbsp;&nbsp;current&nbsp;&nbsp;overcurrent protection, fault logging, and event logging functions.<\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph {\"style\":{\"typography\":{\"textAlign\":\"center\"}},\"fontSize\":\"large\"} -->\n<p class=\"has-text-align-center has-large-font-size\"><strong>Panel Display<\/strong><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":3647,\"width\":\"840px\",\"height\":\"auto\",\"aspectRatio\":\"1.6604043657183754\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\",\"align\":\"center\"} -->\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img src=\"https:\/\/acrel.pl\/wp-content\/uploads\/2026\/08\/ALP220-EF-display.png\" alt=\"\" class=\"wp-image-3647\" style=\"aspect-ratio:1.6604043657183754;width:840px;height:auto\"\/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph {\"style\":{\"typography\":{\"textAlign\":\"center\"}},\"fontSize\":\"large\"} -->\n<p class=\"has-text-align-center has-large-font-size\"><strong>Wiring<\/strong><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":3648,\"width\":\"840px\",\"height\":\"auto\",\"aspectRatio\":\"0.9502836169502836\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\",\"align\":\"center\"} -->\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img src=\"https:\/\/acrel.pl\/wp-content\/uploads\/2026\/08\/ALP220-EF-3p4w-wiring-1.png\" alt=\"\" class=\"wp-image-3648\" style=\"aspect-ratio:0.9502836169502836;width:840px;height:auto\"\/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:image {\"id\":3649,\"width\":\"840px\",\"height\":\"auto\",\"aspectRatio\":\"0.9502890173410404\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\",\"align\":\"center\"} -->\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img src=\"https:\/\/acrel.pl\/wp-content\/uploads\/2026\/08\/ALP220-EF-3p3w-wiring-1.png\" alt=\"\" class=\"wp-image-3649\" style=\"aspect-ratio:0.9502890173410404;width:840px;height:auto\"\/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph {\"style\":{\"typography\":{\"textAlign\":\"center\"}},\"fontSize\":\"large\"} -->\n<p class=\"has-text-align-center has-large-font-size\"><strong>Technical Parameters<\/strong><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:table {\"align\":\"center\"} -->\n<figure class=\"wp-block-table aligncenter\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Technical parameter<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"3\">Qualification<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"2\">Accessory power supply<\/td><td class=\"has-text-align-center\" data-align=\"center\">Voltage range<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">AC\/DC 85\uff5e265V<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Power dissipation<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"3\">Import<\/td><td class=\"has-text-align-center\" data-align=\"center\">Current specifications<\/td><td class=\"has-text-align-center\" data-align=\"center\">ABCN (4-channel): 1A\/5A<\/td><td class=\"has-text-align-center\" data-align=\"center\">10%Ie\uff5e1000%Ie \u00b12%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Residual currentspecification<\/td><td class=\"has-text-align-center\" data-align=\"center\">30mA-1000mA<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00b12%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Frequency<\/td><td class=\"has-text-align-center\" data-align=\"center\">45Hz-65Hz<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u00b10.2Hz<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"2\">Output<\/td><td class=\"has-text-align-center\" data-align=\"center\">Output method<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">Dual-channel single-pole double-throw switch<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Output capacity<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">Resistive load; AC 250 V 5 A \/ DC 30 V 5 A<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"7\">Installation andUsage Environment<\/td><td class=\"has-text-align-center\" data-align=\"center\">Workplace Scenario<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">No direct exposure to rain or snow; no corrosive gases; no severe vibration<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Relative humidity<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">\u226495% RH, no condensation<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Working temperature<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">-20\u2103~+70\u2103<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Storage temperature<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">-40\u2103~+70\u2103<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Height<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">\u22642000m<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Way to install<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">Embedded installation: 88\u00d788 (mm)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Levels of protection<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">Panel: IP54; Terminals: IP20<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Security classification<\/td><td class=\"has-text-align-center\" data-align=\"center\">EMC<\/td><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">Level III<\/td><\/tr><\/tbody><\/table><\/figure>\n<!-- \/wp:table -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph {\"style\":{\"typography\":{\"textAlign\":\"center\"}},\"fontSize\":\"large\"} -->\n<p class=\"has-text-align-center has-large-font-size\"><strong>Functional Configuration<\/strong><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:table -->\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\" colspan=\"2\">Function<\/td><td class=\"has-text-align-center\" data-align=\"center\">Standard configuration<\/td><td class=\"has-text-align-center\" data-align=\"center\">Optional<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"3\">Measurement Function<\/td><td class=\"has-text-align-center\" data-align=\"center\">Three-phase alternating current<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Neutral conductor current<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Residual current<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"6\">Defencive function<\/td><td class=\"has-text-align-center\" data-align=\"center\">Inverse-time overcurrent protection<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Inverse Time Grounding<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Three-stage time-delayedovercurrent protection<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Three-stage time-delayedground fault protection<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Current imbalance<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Leakage current<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Communication Function<\/td><td class=\"has-text-align-center\" data-align=\"center\">Modbus-RTU<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Digital output function<\/td><td class=\"has-text-align-center\" data-align=\"center\">2 Single-pole double-throw switch<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"2\">Record Function<\/td><td class=\"has-text-align-center\" data-align=\"center\">20 Single fault record<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">20 Event Record<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Display Function<\/td><td class=\"has-text-align-center\" data-align=\"center\">Liquid-crystal display<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\" rowspan=\"2\">Setpoint Setting Function&nbsp;<\/td><td class=\"has-text-align-center\" data-align=\"center\">Operation Panel Modification<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\">&nbsp;<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Communication Amendment<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u221a<\/td><td class=\"has-text-align-center\" data-align=\"center\"><\/td><\/tr><\/tbody><\/table><\/figure>\n<!-- \/wp:table -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph -->\n<p><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:paragraph {\"style\":{\"typography\":{\"textAlign\":\"center\"}},\"fontSize\":\"large\"} -->\n<p class=\"has-text-align-center has-large-font-size\"><strong>Dimension<\/strong><\/p>\n<!-- \/wp:paragraph -->\n\n<!-- wp:image {\"id\":3653,\"width\":\"575px\",\"height\":\"auto\",\"aspectRatio\":\"0.8868067698195374\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\",\"align\":\"center\"} -->\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img src=\"https:\/\/acrel.pl\/wp-content\/uploads\/2026\/08\/\u56fe\u72471.png\" alt=\"\" class=\"wp-image-3653\" style=\"aspect-ratio:0.8868067698195374;width:575px;height:auto\"\/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:image {\"id\":3652,\"width\":\"380px\",\"height\":\"auto\",\"aspectRatio\":\"0.5396874612427136\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\",\"align\":\"center\"} -->\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img src=\"https:\/\/acrel.pl\/wp-content\/uploads\/2026\/08\/\u56fe\u72472.png\" alt=\"\" class=\"wp-image-3652\" style=\"aspect-ratio:0.5396874612427136;width:380px;height:auto\"\/><\/figure>\n<!-- \/wp:image -->\n\n<!-- wp:image {\"id\":3651,\"width\":\"555px\",\"height\":\"auto\",\"aspectRatio\":\"1.0320393891822464\",\"sizeSlug\":\"full\",\"linkDestination\":\"none\",\"align\":\"center\"} -->\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img src=\"https:\/\/acrel.pl\/wp-content\/uploads\/2026\/08\/\u56fe\u72473.png\" alt=\"\" class=\"wp-image-3651\" style=\"aspect-ratio:1.0320393891822464;width:555px;height:auto\"\/><\/figure>\n<!-- \/wp:image -->","protected":false},"excerpt":{"rendered":"\u25cf Inverse-time Overcurrent & Earth-fault\n\u25cf Three-stage Definite-time Overcurrent & Earth-fault\n\u25cf Current Unbalance Protection\n\u25cf Residual Current Monitoring","protected":false},"featured_media":3645,"template":"","productcat":[6,44],"class_list":["post-3643","product","type-product","status-publish","has-post-thumbnail","hentry","productcat-power-protection","productcat-motor-protection"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - 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