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A square drawn on a conductor line.
Also known as: CB symbol, Breaker symbol electrical
The single-line diagram symbol for a circuit breaker, a device that can interrupt fault current.
Marks a circuit breaker on a single-line diagram.
Contexts: Technical drawing
Is distinguished from a disconnector by being able to interrupt fault current, a difference the two symbols must carry because operating the wrong one under load is dangerous.
Contexts: Technical drawing
A small square drawn on the conductor line, sometimes shown filled or open according to its normal state.