In Electrical Terms What Is an Rcd?

An RCD, or residual current device, is a life-saving device which is designed to prevent you from getting a fatal electric shock if you touch something live, such as a bare wire.

What is an RCD and what does it do?

RCDs are electrical safety devices designed to immediately switch off the supply of electricity when electricity leaking to earth is detected at harmful levels. They offer high levels of personal protection from electric shock.

Is an RCD the same as a circuit breaker?

The difference between a circuit breaker (MCB) and a RCD

Its basic function is to interrupt current flow (break the circuit) after a fault is detected. An RCD, which stands for Residual Current Device, is designed for human safety, and can often be life-saving.

Maya Lin-Takahashi

Maya Lin-Takahashi

Consumer Tech & Gadget Reviewer

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.