{"product_id":"abb-rej525b412baa-earth-fault-protection-relay","title":"ABB REJ525B412BAA Earth-Fault Protection Relay","description":"\u003cp\u003eThe \u003cstrong\u003eABB REJ525B412BAA\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eREJ525\u003c\/strong\u003e Protection Relay, operates as a dedicated hardware component for continuous phase and neutral current measurement and circuit breaker tripping within electrical distribution systems.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eREJ525\u003c\/strong\u003e: Base designation for the ABB numerical combined overcurrent and earth-fault protection relay platform.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eB412BAA\u003c\/strong\u003e: Specific hardware build, auxiliary power supply range, and factory default parameter configuration variant.\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\u003eREJ525B412BAA\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 configuration and data logging\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 overcurrent and 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 relay modules or power supply 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 overcurrent and earth-fault units?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The overcurrent unit includes low-set stage I\u0026gt; and high-set stage I\u0026gt;\u0026gt;; the earth-fault unit includes low-set stage I0 \u0026gt; and high-set stage I0 \u0026gt;\u0026gt;.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How are internal fault records and disturbance waveforms captured?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The device incorporates an integrated disturbance recorder and continuous self-supervision to log operational data and fault sequences.\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":45284620271731,"sku":"REJ525B412BAA","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/REJ525REJ525B412BAA_f10865f1-f43e-4967-b78d-df577f1ab11a.png?v=1785145698","url":"https:\/\/www.dcssupplier.com\/ar\/products\/abb-rej525b412baa-earth-fault-protection-relay","provider":"DcsSupplier Limited","version":"1.0","type":"link"}