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What is RCCB in electrical ? how it function ?and explanation of RCCB, Construction ofRCCB?

Asked by sara suji, 29 Jul '07 12:58 am
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Answers (1)


A residual current device (RCD), or residual current circuit breaker (RCCB), is an electrical wiring device that disconnects a circuit whenever it detects that the flow of current is not balanced between the phase ("hot") conductor and the neutral conductor. Such an imbalance is sometimes caused by current leakage through the body of a person who is grounded and accidentally touching the energized part of the circuit. A shock, possibly lethal, is likely to result from these conditions; RCDs are designed to disconnect quickly enough to greatly reduce the harm caused by such shocks.

In the United States and Canada, a residual current device is also known as a ground fault circuit interrupter (GFCI), Ground Fault Interrupter (GFI) or an appliance leakage current interrupter (ALCI).

Purpose and operation
RCDs operate by measuring the current balance between two conductors using a differential current transformer, and opening the device's contacts if there is a balance fault (i.e. su ...more
Answered by Narendra Kumar, 17 Feb '10 07:09 pm

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