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A breaker marked with a current-comparison box.
Also known as: RCD symbol, GFCI symbol, Earth leakage breaker, RCBO symbol
A residual current device compares the current flowing out with the current returning and opens if they differ, which is how it detects current leaking to earth through a person. It protects people, where an ordinary breaker protects wiring, and the two are not interchangeable.
Denotes a device that opens the circuit when the outgoing and returning currents differ by more than a set amount, indicating leakage to earth.
Contexts: Technical drawing, Electrical equipment
Protects against electric shock, a different job from the overload protection an ordinary circuit breaker provides, so an installation generally needs both.
Contexts: Technical drawing, Electrical equipment
A breaker outline with an added rectangle containing a marking that shows two conductors being compared.