{"product_id":"abb-rej603-numerical-relay-for-rmu-secondary-distribution","title":"ABB REJ603 | Numerical Relay for RMU \u0026 Secondary Distribution","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eABB REJ603 (Part Number: 1VYV91248286)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003estands as a specialized numerical relay within the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRelion® 605 series\u003c\/strong\u003e, engineered specifically for secondary distribution switchgear and Ring Main Units (RMUs). This device utilizes a unique\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eself-powered design\u003c\/strong\u003e, drawing operational energy directly from the feeder current transformers. By eliminating the dependency on external auxiliary power supplies, the REJ603 ensures reliable protection in remote or unmanned locations where battery maintenance is impractical. We offer this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor critical infrastructure deployment.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eREJ603 (Relion® 605 Series)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSelf-powered via Phase CTs (No external DC\/AC needed)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCurrent Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Channels (Selectable 1 A or 5 A)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProtection Stages\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLow-set and High-set Overcurrent \u0026amp; Earth-fault\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOutput Contacts\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTrip Contact \u0026amp; Alarm Contact\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFault Signaling\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eLED Indicators and Mechanical Trip Flag\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCompliant with EN 60255-6 Standards\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e–25°C to +55°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEnvironmental\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eEMC Directive 2004\/108\/EC\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eZero-Maintenance Power Architecture:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe REJ603 powers its internal electronics using the primary current through the CTs. This design removes the \"single point of failure\" associated with auxiliary battery banks and chargers, significantly reducing operational expenditure in rural or isolated grids.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRapid Fault Signaling:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEven in total darkness or power loss, the mechanical flag indicator provides a permanent visual record of a trip. This hardware-based signal assists field crews in identifying faulted sections immediately without needing to power up the relay's HMI.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSpace-Efficient Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe compact housing fits perfectly into narrow RMU compartments. Its standardized mounting footprint allows for quick installation in both new panel builds and retrofitting projects where space is at a premium.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDeterministic Protection Performance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe unit employs two-stage non-directional overcurrent and earth-fault protection. These stages allow for precise grading with upstream and downstream devices, ensuring that only the faulted segment is isolated while maintaining power to the rest of the network.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSelf-Supervision Intelligence:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAn internal watchdog continuously monitors the hardware and software integrity. If the relay detects an internal failure, it triggers an alarm, preventing \"silent failures\" that could leave a feeder unprotected.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the ABB REJ603 require a minimum current to start up?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Since the unit is self-powered, it requires a minimum threshold current from the phase CTs to energize the electronics. However, the relay reaches operational readiness at very low load levels, ensuring protection is active long before a fault occurs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use the REJ603 with standard 1A or 5A Current Transformers?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe REJ603 supports both 1 A and 5 A secondary ratings. You must select the correct version or configure the inputs to match your specific CT ratios to ensure accurate measurement and trip timing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I retrieve fault data if the feeder is de-energized?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe mechanical trip flag stays in the \"tripped\" position even after power is lost. For digital event logs, some versions support a temporary power interface or internal capacitor storage that allows engineers to extract data via the HMI or communication port after the event.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this unit compatible with IEC 61850?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe standard self-powered REJ603 focuses on autonomous protection. While higher-tier Relion models offer full IEC 61850 stacks, the REJ603 typically provides simplified signaling or optional HMI interfaces depending on the specific hardware variant (1VYV series).\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":43324121645146,"sku":"REJ603","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/548.1.jpg?v=1778116066","url":"https:\/\/www.spareoil.com\/products\/abb-rej603-numerical-relay-for-rmu-secondary-distribution","provider":"SpareOil Automation","version":"1.0","type":"link"}