ELR-4MD DC Earth Leakage Relay

Information

Blue Jay ELR-4MD is a DIN rail mounted DC earth leakage relay complying with IEC 60755 Type A standard, specially designed for DC power systems. Matching Hall effect current sensors, it precisely detects AC and pulsating DC leakage currents on DC circuits. It features a backlit LCD screen for real-time leakage value display, universal 85–265V AC/DC power supply, and fully adjustable leakage threshold (5mA–3A) plus trip delay ranging from 50ms to 10 seconds. Its compact 78×90×60mm DIN rail structure fits neatly inside standard DC cabinets for new energy, charging and industrial DC equipment. This DC earth leakage relay adopts dual-stage pre-alarm and fault alarm logic, locking alarm signals until manual reset to simplify fault troubleshooting. It comes with independent safety trip and alarm relay outputs, plus external test/reset digital inputs for regular equipment inspection. Built-in RS485 Modbus-RTU communication supports remote parameter setting and real-time data upload to SCADA and PLC platforms. Widely used in energy storage, DC charging piles, DC power panels and industrial DC distribution systems, it monitors insulation leakage in real time to avoid electric shock, short-circuit and fire risks caused by DC grounding faults.
Chongqing Blue Jay Technology Co., LtdZ3.H18Blue Jay is a professional Chinese local industrial power and energy meter manufacturer with over 10 years of experience. We hold full capabilities in industrial power and energy meter manufacture, which supports us in offering you a one-stop solution for OEM/ODM customers. Many times, we are not only manufacturing for you but also supporting your design according to your final applications. Our capabilities include manufacturing and designing power and energy meter solutions. We also can manufacture a variety of protection relays such as motor protection relays, arc flash relays, DC insulation monitoring relays, partial discharge monitoring, earth leakage relays, current transformers, hall effect sensors, and much more. We can manufacture power energy meters & protection relay according to your design. We also can design circuits, functions, UI, and packaging, and manufacture the final products as per your requirements. Our company introduces advanced management concepts and scientific management models, implements ISO9001 international quality standards, s and adapts home and abroad advanced R&D, production, and testing equipment. As an ISO 9001-certified power meter and protection relay company, Blue Jay controls quality from CE, RoHS, and after-sales. In many cases, we can also support you to optimize designs which can reduce cost and the risk of failure on real applications. Blue Jay offers very competitive prices because we have the leverage of high volume production, 2 factories with over 20, 000 m2 area, and China's low production cost. Until now, our products have been trusted by 1000+ Clients from Russia, India, Iran, Thailand, Korea, Malaysia, Sudan and South America, Guyana, and other countries. In one word, Blue Jay is a customer-oriented enterprise that offers you a one-stop energy meter and protection relay solution at a competitive price. Just send us an inquiry for further discussion.

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