Littelfuse, Inc. Protection Relays & Systems D0100.0020

The D0100.0020 is an arc-flash relay designed for monitoring arc faults in electrical enclosures using optical sensors. It operates on 24 Vdc and supports up to two direct light sensor connections or up to 16 sensors via optional junction boxes. The relay has a trip time of less than 1 ms and features adjustable light sensitivity from 2,000 to 24,000 lux. It includes a service mode for system testing without tripping and complies with EMC standards EN50081-1/2 and EN50082-1/2. The device measures 90 mm high, 105 mm wide, and 75 mm deep, consumes 4.3 W, and operates in ambient temperatures from -25°C to +70°C.