Universal earth leakage protection relay
The EFR-4/EFR-5 Earth Leakage Protection Relay from FDB Electrical forms part of the Optima range of low-cost, high-specification RCDs. It 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 medium to high current applications where space is a limitation. It is housed in a compact DIN-rail mounting enclosure, complete with integral 28 or 46mm C.T. sensory coil and fitted with test, reset buttons and LED status indication.
Fully encapsulated construction of the EFR-4 and 5 provides temperature stability, together with high immunity against shock and vibration. Housed in flame retardant ABS material as standard the EFR-4/EFR-5 Built-in features include fail-safe 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-4/EFR-5 is designed to react to alternating current only and to reject stray DC signals. It maintains accuracy over a wide frequency band from 5Hz to 800Hz making the unit suitable for application on variable frequency drives. The EFR-4/EFR-5 can be used on solid, medium or high resistance grounded installations and, by using the recommended artificial ground package, even on ungrounded installations.
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