{"product_id":"abb-419b0044-high-impedance-differential-relay","title":"ABB 419B0044 High-Impedance Differential Relay","description":"\u003cdiv\u003e\u003cp\u003eABB 419B0044 High-Impedance Differential Relay (Type 87B) is a compact, single-phase, high-speed bus differential protection relay in ABB’s 419B catalog series. It is designed for fast isolation of internal faults within a protected zone such as a substation bus or switchgear, using solid-state circuits to provide instantaneous protection. The Type 87B operates as a high-impedance differential relay, continuously comparing currents from current transformers across the protected boundary and issuing a trip when the differential exceeds the preset, with no restraining circuits in the standard configuration. This makes it well suited to busbar differential protection where rapid fault clearance is critical. The 419B0044 designation identifies this particular unit within ABB’s 419B family, reflecting ABB’s long-standing focus on high-speed, high-impedance bus protection solutions. Typical installations couple the 87B with appropriately configured CT inputs to monitor the protected zone and coordinate with the protection scheme for fast, selective tripping of the associated circuit breakers, helping to minimize damage and improve system stability in substations and feeder configurations.\u003c\/p\u003e\u003c\/div\u003e","brand":"ABB","offers":[{"title":"New","offer_id":51656891990318,"sku":null,"price":479.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_8798e418-f1a9-4008-ab23-5e175b72aba5.jpg?v=1769464102","url":"https:\/\/plgautomation.com\/products\/abb-419b0044-high-impedance-differential-relay","provider":"PLG Automation ","version":"1.0","type":"link"}