A Residual Current Circuit Breaker (RCCB) is an important safety measure when it comes to protection of electrical circuits. It is a current sensing device, which can automatically measure and disconnect the circuit whenever a fault occurs in the connected circuit or the current exceeds the rated sensitivity.
A person can feel prickling sensations when he contacts with 10 mA of current. If he gets contact with 30 mA of current, he will face muscle contraction that might leads to respiratory paralysis. And when he gets in touch with above 100 mA, it will lead to electrocution.
RCCB is particularly useful in situations where there is a sudden earth fault occuring in the circuit. e.g. A person accidentally comes in contact with an open live wire in the circuit. In such situation, in absence of an RCCB in the circuit, an earth fault may occur and the person is at the risk of receiving an electrical shock. However, if the same circuit is protected with RCCB, it will trip the circuit in fraction of a second thus preventing the person from receiving an electrical shock. Therefore, it is a good and safe practice to install RCCB in your electrical circuit.
