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A switch drawn with a marking showing automatic operation.
Also known as: MCB symbol, Miniature circuit breaker, Automatic switch
A circuit breaker is a switch that opens by itself under fault current and can be reset, unlike a fuse which is consumed. Its symbol is a switch with an added marking — a small square or a cross — showing that the operation is automatic.
Denotes a switching device that opens automatically under overload or fault conditions and can be closed again afterwards.
Contexts: Technical drawing, Electrical equipment
Differs from the fuse in being resettable: a fuse is destroyed by the fault it interrupts and a breaker is not.
Contexts: Technical drawing, Electrical equipment
A hinged line lifting away from a contact, with a small square or crossed marking added at the moving end.
Both interrupt a fault; one survives it.