{"product_id":"relion-self-powered-overcurrent-relay-abb-rej603","title":"Relion Self-Powered Overcurrent Relay | ABB REJ603","description":"\u003ch2\u003eABB REJ603 Relion 605 Series Self-Powered Feeder Protection Relay\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eABB REJ603\u003c\/strong\u003e is a self-powered feeder protection relay belonging to the ABB Relion 605 series, engineered for medium-voltage secondary distribution networks, ring main units (RMUs), and compact switchgear. Operating without requiring an external auxiliary power supply, it derives its operating and trip energy directly from the main current transformers (CTs), making it reliable for remote or unmanned substations where auxiliary control power is unavailable.\u003c\/p\u003e\n\u003ch3\u003eProtection Functions and Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe relay provides non-directional three-phase overcurrent protection (ANSI 50\/51) and earth-fault protection (ANSI 50N\/51N), supplemented by inrush-current restraint and thermal overload protection (ANSI 49). Time-current characteristics include definite time and inverse definite minimum time (IDMT) curves such as normal inverse, very inverse, extremely inverse, long-time inverse, RI, and specialized fuse curves. Earth-fault measurement is handled via internal vector calculation from phase CTs or an external core-balance current transformer (CBCT).\u003c\/p\u003e\n\u003ch3\u003eInterface, Power Options, and Outputs\u003c\/h3\u003e\n\u003cp\u003eConfiguration parameters are adjusted via onboard DIP switches, while operational status is indicated through READY and internal relay failure (IRF) LEDs alongside a manual-reset mechanical trip flag. While primarily CT-powered, the unit supports optional front-panel USB power input for event log reading and configuration tasks. Output signaling includes capacitor-discharge impulse outputs for low-energy trip coils and optional bistable trip contact outputs, with a binary input provided for remote tripping commands.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eREJ603\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003eRelion 605 Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eSelf-Powered Overcurrent and Earth-Fault Protection Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003eSelf-powered from main CTs; optional front USB power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Functions\u003c\/td\u003e\n\u003ctd\u003e3-phase overcurrent, earth-fault, inrush restraint, thermal overload, remote trip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eANSI Protection Codes\u003c\/td\u003e\n\u003ctd\u003e50\/51, 51N\/50N, 68, 49\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTime Characteristics\u003c\/td\u003e\n\u003ctd\u003eDefinite time and IDMT curves (NI, VI, EI, LTI, RI, fuse curves)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEarth-Fault Measurement\u003c\/td\u003e\n\u003ctd\u003eInternal phase CT calculation or external CBCT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTrip Outputs\u003c\/td\u003e\n\u003ctd\u003eCapacitor-discharge impulse output; bistable trip option\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBinary Inputs\u003c\/td\u003e\n\u003ctd\u003eRemote trip input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocal Interface\u003c\/td\u003e\n\u003ctd\u003eDIP switches, READY\/IRF LEDs, manual-reset trip flag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-25 deg C to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the ABB REJ603 relay require an external auxiliary power supply to operate? A: No, the relay is self-powered, deriving its operating and tripping energy directly from the main current transformers.\u003c\/p\u003e\n\u003cp\u003eQ: What core protection functions are integrated into the REJ603? A: It features non-directional three-phase overcurrent protection, earth-fault protection, inrush-current restraint, and thermal overload protection.\u003c\/p\u003e\n\u003cp\u003eQ: How are settings configured on this protection unit? A: Relay parameters and protection settings are configured directly using onboard physical DIP switches.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":51328383222072,"sku":"REJ603","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1616\/3896\/files\/REJ6031.jpg?v=1762762322","url":"https:\/\/www.automodulexpert.com\/products\/relion-self-powered-overcurrent-relay-abb-rej603","provider":"AutoModuleXpert Ltd.","version":"1.0","type":"link"}