RCCB (residual current circuit breaker) detects current difference between neutral and live conductors. The difference is also known as ‘residual current’. Proper functioning circuits will have balanced neutral and live current and the residual current occurs when there is some potential shock hazard or fault. The device is an RCD i.e. residual current device class of item and circuit breaker, which is a part of its name, indicates that the electrical product sits within costumer unit with the other CBs (circuit breakers).
It should not be confused with MCB current rating at which it will trip out.
RCBO means residual current circuit breaker with over current protection, which is a combination of RCCB and MCB.
When current leakage occurs, the RCCB (residual current detecting element) will trip the entire circuit. Similarly, in case the circuit is overloaded then components of internal magnetic/thermal circuit breakers are capable to trip the electronic device.
Dissimilarity Between RCCB And RCBO
Both the electrical devices are normally found in fuse box, which is known as breaker panel or consumer unit. RCCB will only identify current leakage from circuit. On the other hand, RCBO can notice over current and current leakage from the circuit. The device recognizes over current in the same manner as MCB does. RCBO is usually utilized as replacement for MCB in consumer unit.
RCCB is older as well as simpler technology than RCBO and is widely trusted. But RCBO is newer product and uses a built in microcontroller and now becoming popular.
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