Littelfuse, Inc. EL731 Series – Earth-Leakage, Ground-Fault Relay EL731-22-10

The EL731 is a microprocessor-based AC/DC sensitive earth-leakage relay designed for low-level ground-fault protection in variable-speed drives and DC circuits. It features a 48 mm × 96 mm × 129 mm enclosure with panel, surface, and DIN-rail mounting options, a universal power supply of 24 Vdc, and Profibus® communications. The relay supports adjustable trip and alarm settings from 30 to 5,000 mA AC/DC, a trip delay of 0.05 to 2 seconds, three programmable Form C output contacts, and an analog 4-20 mA output. It includes RTD/PTC temperature monitoring, CT-loop monitoring, harmonic filtering, and a 32-character OLED display. Conformal coating is standard, and it is UL Listed, CSA certified, RCM compliant, and CE marked with a five-year warranty.