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How does a rcb circuit breaker work?

Updated: 11/3/2022
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Alanfowler

Lvl 1
10y ago

Best Answer

i dont know, i want to know aswell. eeek.

The RCB/RCD is placed between a 3-wire supply and its load, for example between a wall-socket and a kettle.

The supply must be one with a live, a neutral and an earth. In normal operation equal and opposite currents flow in the live and neutral wires, with no current in the earth wire.

But under fault conditions there could be unbalanced currents in the live and neutral, with the balance flowing in the earth wire. That indicates danger and the device detects it and turns the power off.

Most RCDs operate with a fault current of 10-30 milliamps, that is 0.01 to 0.03 amps.

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