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Home/Glossary/RCD (Residual Current Device)
Electrical Repairs

RCD (Residual Current Device)

A life-saving safety device that detects an imbalance between live and neutral current - which indicates current is flowing through an unintended path such as a person - and cuts the power within milliseconds. Modern consumer units contain RCDs or RCBOs protecting all circuits; older installations may only have partial RCD protection. Test your RCD monthly by pressing the test button.

Related terms

Consumer UnitMCB (Miniature Circuit Breaker)EICR (Electrical Installation Condition Report)Earth Bonding
RCBORender

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