The EFR-2 is part of the 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-2 is designed for use with any of the OPTIMA CT's including a rectangular split core types for busbars and retrofit applications. It is housed in a compact din-rail mounting enclosure complete with integral test and reset buttons and LED status indication.

Built-in features include failsafe operation, manual reset after fault trip, auto reset after power failure and trip status latched until reset (with power supply on). A non-failsafe version is available to special order this should be used in applications where shunt tripping of primary/supply breakers makes failsafe impractical.

The EFR-2 will react to alternating current only and will reject stray DC signals. It will maintain accuracy over an extremely wide bandwidth from 5Hz to 800Hz thus making the unit suitable for application on variable frequency drives. It can be used on solid, medium or high resistance grounded installations and, by using our recommended artificial ground package, even on ungrounded installations.