Littelfuse, Inc. EL731 Series – Earth-Leakage, Ground-Fault Relay EL731-14-10

The EL731 series is a microprocessor-based AC/DC sensitive earth-leakage relay designed for ground-fault protection in variable-speed drives and DC circuits. It supports universal power supply inputs of 120/240 Vac/Vdc, 48 Vdc/24 Vac, or 24 Vdc, and includes optional Modbus™ TCP communication. The relay features a 32-character OLED display, three programmable Form C output contacts, adjustable trip and alarm settings from 30 to 5,000 mA, trip delays from 0.05 to 2 seconds, and an RTD/PTC input for temperature monitoring. It offers harmonic filtering, open- and short-circuit CT detection, and a 4-20 mA analog output. The unit measures 48 mm H × 96 mm W × 129 mm D and supports panel, surface, and DIN-rail mounting with an optional adapter. Conformal coating is standard. The product is UL Listed, CSA certified, RCM compliant, and CE marked, with a five-year warranty.