Littelfuse, Inc. EL731 Series – Earth-Leakage, Ground-Fault Relay EL731-04-10

The EL731 series 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, adjustable trip and alarm settings from 30 to 5,000 mA, and selectable frequency response ranges from 0 to 6,000 Hz. The relay includes three programmable Form C output contacts, an analog 4-20 mA output, and an RTD/PTC input for motor or drive temperature monitoring. It supports EtherNet/IP™, DeviceNet™, Profibus®, and Modbus® TCP communications, with a universal power supply of 120/240 Vac/Vdc, 24 Vdc, or 48 Vdc/24 Vac. Mounting options include panel, surface, and DIN-rail with optional adapter. Dimensions are 48 mm H x 96 mm W x 129 mm D. The device is UL Listed, CSA, RCM, and CE certified, with conformal coating and a five-year warranty.