{"product_id":"schweitzer-engineering-laboratories-321114256vgb1x4-relay","title":"Schweitzer Engineering Laboratories 321114256VGB1X4 Relay","description":"\u003cdiv\u003e\u003cp\u003eThe SEL-321 Phase and Ground Distance Relay from Schweitzer Engineering Laboratories is a four-zone distance protection relay for transmission lines, designed to detect phase and ground faults by measuring line impedance and to trip when the fault lies within a programmed reach. It provides four zones of phase and ground distance protection and uses phase distance elements (Mho distance) along with dedicated ground-distance protection, backed by directional logic to ensure faults are correctly identified relative to the protected line. The unit accepts standard low-level analog inputs, with voltage input in the 1–5 V range and current input in the 0.2–0.4 A range, enabling direct CT\/VT interfacing in common substation configurations. This variant is identified by the part number 321114256VGB1X4, aligning with SEL’s cataloged 321-series distance relays. As a microprocessor-based protective relay, it supports programmable reach and timing settings to tailor protection for specific line configurations and coordination schemes, and it provides robust protection performance essential for reliable substation operation.\u003c\/p\u003e\u003c\/div\u003e","brand":"SCHWEITZER","offers":[{"title":"New","offer_id":46283543019754,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/8039\/3450\/files\/GTG-STOCK-020.png?v=1788727428","url":"https:\/\/gtghardware.com\/products\/schweitzer-engineering-laboratories-321114256vgb1x4-relay","provider":"GTG Hardware","version":"1.0","type":"link"}