Littelfuse, Inc. EL731 Series – Earth-Leakage, Ground-Fault Relay EL731-12-00

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 supports universal power supply inputs of 120/240 Vac/Vdc, 48 Vdc/24 Vac, or 24 Vdc, and includes optional Profibus® communication. The relay features three programmable Form C output contacts, adjustable trip and alarm settings from 30 to 5,000 mA AC/DC, trip delays of 0.05 to 2 seconds, and a 32-character OLED display. It accepts RTD/PTC sensor inputs for temperature monitoring and includes CT loop monitoring, harmonic filtering, and an analog 4-20 mA output. The device is conformally coated and mounts via panel, surface, or DIN-rail (with optional AC700-SMK). It measures 48 mm H × 96 mm W × 129 mm D and is UL Listed, CSA, RCM, and CE certified with a five-year warranty.