Moulded Case Circuit Breaker
Ref. No.: 431139   Cat. No.:
FE250-RCD DiffBottom-3p 200-440V
A record plus circuit breaker can offer protection against earth leakage currents by using an add-on residual current device (RCD). A line of three pole completely integrated add-on devices are available as side mounted models (FD frame size) or as units that are fitted below the trip unit of the breaker (FD, FE and FG frame sizes). In all cases the RCD unit interfaces directly with the circuit breaker without the use of any secondary wiring connections. Earth RCD has a sensor placed around the phase and neutral currecnt paths that detects the vectorital sum of the phase and neutral currents. When this sum is no longer zero it is assumed that current is flowing to earth (residual current). If this value exceeds the threshold set on the RCD the breaker conneted to the device is trippe.