{"product_id":"abb-rej-511-earth-fault-protection-relay","title":"ABB REJ 511 Earth-Fault Protection Relay","description":"\u003cp\u003eThe \u003cstrong\u003eABB REJ 511\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eREJ 511\u003c\/strong\u003e Earth-Fault Protection Relay, operates as a dedicated secondary relay component for measuring neutral current, executing fault isolation, and providing disturbance recording across electrical distribution networks.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eREJ 511\u003c\/strong\u003e: Base designation for the ABB numerical earth-fault protection relay platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware Configuration\u003c\/strong\u003e: Standard modular enclosure profile equipped with internal digital measurement cores and configurable output contact matrices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware 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\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eREJ 511\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSweden \/ Finland\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 2.0 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard compact relay enclosure profile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-10 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMax 15 W \/ 25 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard auxiliary control voltage range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Ports\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSerial interface slots for local setting and data extraction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlush panel or subrack mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSystem Integration and Communication Architecture\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Bus Communication Velocity\u003c\/strong\u003e: Executes deterministic internal data routing across internal microprocessor buses to maintain fast earth-fault threshold tripping calculations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfinet \/ EtherNet\/IP Deterministic Networks\u003c\/strong\u003e: Supports standardized auxiliary communication protocols for local event extraction, disturbance record downloading, and parameter configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O Density Scaling\u003c\/strong\u003e: Integrates configurable output contact matrices routing start and trip signals from independent protection stages to desired relay output terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirmware Flash Compatibility\u003c\/strong\u003e: Permits internal self-supervision and parameter adjustments via protected communication interfaces without altering physical switchgear wiring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the internal power supply or relay modules be replaced while the switchgear panel is energized?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, module replacement requires de-energizing the unit and isolating connected current transformer secondary circuits to prevent open-circuit high-voltage hazards.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What protection stages are included in the earth-fault unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The unit includes a low-set stage with definite time or IDMT characteristics and a high-set stage with instantaneous or definite time characteristics.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the relay support circuit-breaker failure protection?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes, it incorporates an integrated circuit-breaker failure protection unit alongside a disturbance recorder and continuous self-supervision.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure the relay case earth terminal is connected directly to the switchgear ground bus using a low-impedance conductor.\u003c\/li\u003e\n\u003cli\u003eVerify that auxiliary supply voltage levels match the rated input range prior to energizing the unit.\u003c\/li\u003e\n\u003cli\u003eTerminate all current transformer secondary leads securely to the rear terminal blocks, ensuring proper shorting links are removed only after final connection.\u003c\/li\u003e\n\u003cli\u003eMaintain clear vertical clearance around the compact enclosure to ensure proper thermal dissipation across the specified operating temperature range.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":45284556800115,"sku":"REJ 511","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/REJ511_1eded8ab-7e57-4cfe-a360-0033c197d167.png?v=1785143575","url":"https:\/\/www.dcssupplier.com\/products\/abb-rej-511-earth-fault-protection-relay","provider":"DcsSupplier Limited","version":"1.0","type":"link"}