{"product_id":"ref541km115aaaa-ref541-abb-feeder-protection-terminal","title":"REF541KM115AAAA REF541 ABB Feeder Protection Terminal","description":"\u003ch2\u003eABB REF541KM115AAAA REF54x Feeder Protection Terminal\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eABB REF541KM115AAAA\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eREF541\u003c\/strong\u003e Feeder Protection Terminal, operates as a dedicated hardware component for numerical overcurrent and directional earth-fault protection within medium-voltage distribution systems. The unit captures 1 A or 5 A current transformer inputs and up to 110 VAC voltage secondary signals across 50\/60 Hz networks. It executes high-speed trip logic, thermal overload processing, and breaker interlocking, communicating field data via SPA bus, Modbus RTU, and IEC 60870-5-103 protocols.\u003c\/p\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003eREF541KM115AAAA\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\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSweden\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e160 x 180 x 200 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-25 to +70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eWide-range 24-250 VDC \/ 48-240 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eFeeder Protection and Control Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Current Input\u003c\/td\u003e\n\u003ctd\u003e1 A or 5 A (Selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Voltage Input\u003c\/td\u003e\n\u003ctd\u003eUp to 110 VAC (VT Secondary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Frequency\u003c\/td\u003e\n\u003ctd\u003e50 \/ 60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocols\u003c\/td\u003e\n\u003ctd\u003eSPA bus, Modbus RTU, IEC 60870-5-103\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEvent Logging\u003c\/td\u003e\n\u003ctd\u003eCOMTRADE disturbance recorder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHigh-Speed Backplane Execution and Network Determinism\u003c\/h3\u003e\n\u003cp\u003eThe terminal utilizes dedicated real-time processing architecture to ensure rapid trip signal propagation down to sub-cycle execution times. Internal firmware flash compatibility supports deterministic data transfer over substation serial communication lines, maintaining tight synchronization across measurement channels. Non-volatile flash memory continuously captures sequence-of-events logs and COMTRADE disturbance records, preserving crucial fault waveforms during complete auxiliary power failures.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is the secondary current transformer rating toggled between 1 A and 5 A modes?\u003c\/p\u003e\n\u003cp\u003eA: CT secondary matching utilizes selectable physical hardware terminal connections paired with internal software configuration parameters set via the front HMI or relay management software.\u003c\/p\u003e\n\u003cp\u003eQ: What power range does the auxiliary supply unit accommodate?\u003c\/p\u003e\n\u003cp\u003eA: The integrated universal power supply operates reliably across an input band of 24 to 250 VDC or 48 to 240 VAC, insulating internal logic from substation battery voltage sags.\u003c\/p\u003e\n\u003cp\u003eQ: How does the internal disturbance recorder export captured fault data?\u003c\/p\u003e\n\u003cp\u003eA: Captured fault waveforms and sequence-of-events logs export in standardized IEEE COMTRADE file formats over the integrated serial communication ports or front diagnostic interface.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the terminal into a standard panel cutout using the flush-mounting frame kit, tightening all corner retaining clamps to secure the front panel seal against dust and moisture. Establish a direct low-impedance ground connection from the chassis grounding terminal to the cabinet earth bus bar using a short braided copper strap prior to applying power.\u003c\/p\u003e\n\u003cp\u003eRoute secondary CT and VT measurement conductors through dedicated test terminal blocks to facilitate safe secondary injection testing and isolation. Separate sensitive serial communication wiring (SPA bus, Modbus RTU) from high-voltage AC control circuits within cabinet wiring trunks. Ensure all signal cable shielding grounds at a single entry point on the cabinet chassis to prevent common-mode noise corruption.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":43027054952538,"sku":"REF541","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/39_67bcee12-09a0-4376-a1b6-8dc77c0daeaf.jpg?v=1773201410","url":"https:\/\/www.spareoil.com\/products\/ref541km115aaaa-ref541-abb-feeder-protection-terminal","provider":"SpareOil Automation","version":"1.0","type":"link"}