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

The SE-703-0T-00 is a microprocessor-based earth-leakage monitor designed for grounded systems, offering sensitive ground-fault detection as low as 25 mA and harmonic filtering to prevent nuisance tripping. It operates on a 48 Vdc supply and features two isolated Form C output contacts for tripping or alarm circuits, an analog 0-5 V output for external meters or PLCs, and CT-loop monitoring. The device complies with AS/NZS 2081:2011 in fail-safe mode and is certified to CSA, UL, CE, and RCM standards. It has a DIN-rail and surface-mountable design with dimensions of 75 mm height, 55 mm width, and 115 mm depth. Conformal coating is standard, and it includes a test and reset button.