Inevitable in almost all electrical switchboards – Residual current device (RCD)

[saikat07]

Technology that RCD uses is so simple and so magical. The residual current device continually measures the difference between the value of the outgoing and incoming currents in the circuit it is protecting. If this difference is not equal to zero, that means there is a leakage current or a fault current.
When this current’s value reaches the residual current device’s set threshold, it automatically cuts off the circuit’s power supply. Simple as that.

The main function of residual current devices is to provide protection against indirect contacts. High sensitivity models also contribute to ensuring protection against direct contacts.