Littelfuse, Inc. EL731 Series – Earth-Leakage, Ground-Fault Relay EL731-04-00

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 features a 32-character OLED display, three programmable Form C output contacts, and supports adjustable trip and alarm settings from 30 to 5,000 mA with trip delays of 0.05 to 2 seconds. The relay accepts input from RTD/PTC sensors for temperature monitoring and includes a 4-20 mA analog output. It operates with a universal power supply of 120/240 Vac/Vdc or 24/48 Vdc/24 Vac and offers Modbus® TCP network communication. Mounted via panel, surface, or DIN-rail (with optional adapter), its dimensions are 48 mm H × 96 mm W × 129 mm D. It includes conformal coating and meets UL, CSA, RCM, and CE certifications.