The EFR-1 is part of the OPTIMA range of low cost, high specification RCD's designed for the specialist panel builder and is ideal for general purpose, low current applications where Space and Economy are important considerations.

The EFR-1 is housed in a Single Module Din Rail Housing complete with integral test button & screw clamp terminals to simplify connection. It is available with a choice of pre-set current & time trip levels from 20mA to 500mA: instantaneous, 60Ms, 300mS. It can be connected to operate a shunt trip, UVR, or contractor coil. Flying leads for remote test facility are also available to special order.

It is supplied for operation at frequencies 50/60 Hz and available to order at 300/400 Hz.

The fully encapsulated construction provides excellent temperature stability together with immunity against shock and vibration. Despite its compact size (only 17.5 mm wide), the EFR-1 can be used with any of OPTIMA CT's with internal diameters ranging from 16 mm to 250 mm.