The EFR-4/EFR-5 forms part of the extensive OPTIMA range of low cost, high specification RCD's and can be specified at a wide range of trip levels and response times for precise system protection.

The EFR-4/EFR-5 is designed for a medium to high current applications where space is a limitation. It is housed in a compact din-rail mounting enclosure complete with 28 or 46 mm C.T. and fitted test, reset and LED status indication.

The fully encapsulated construction provides excellent temperature stability together with high immunity against shock and vibration. Housed in flame retardant ABS material as standard the EFR-4/EFR-5 can also be supplied in halogen-free polycarbonate housings to special order.