Littelfuse, Inc. EL731 Series – Earth-Leakage, Ground-Fault Relay EL731-21-00

The EL731-21-00 is an AC/DC sensitive earth-leakage relay with a 24 Vdc power supply and DeviceNet™ communication. It features adjustable trip and alarm settings from 30 to 5,000 mA, a trip delay of 0.05 to 2 seconds, three programmable Form C output contacts, and an analog 4-20 mA output. The relay supports CT open- and short-circuit monitoring, RTD/PTC temperature sensing, and operates across frequency ranges from 0 to 6,000 Hz with optional CT configurations. It includes a 32-character OLED display, local LED indicators, and a universal power input. The device is conformally coated, has plug-in terminals for 24 to 12 AWG wire, and measures 48 mm H × 96 mm W × 129 mm D. Mounting options include panel, surface, and DIN-rail with optional adapter. Approvals include UL Listed, CSA, RCM, and CE.