Littelfuse, Inc. SE-703 Series – Earth-Leakage Monitor SE-703-0D-00

The SE-703-0D-00 is a microprocessor-based earth-leakage monitor designed for grounded systems, operating on 12/24 Vdc control power. It provides sensitive ground-fault detection from 25 mA to 500 mA with adjustable time delays up to 500 ms and features two isolated Form C output contacts for tripping or alarming. The unit includes harmonic filtering to prevent nuisance tripping, CT-loop monitoring, fail-safe operating mode, and a 0-5 V analog output for external metering or control systems. It is conformally coated, complies with AS/NZS 2081:2011, and is CSA certified, UL Listed, CE marked, and RCM compliant. The device mounts on DIN rail or via optional panel adapters, measuring 75 mm high, 55 mm wide, and 115 mm deep.