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1. circuit breaker


A device designed to interrupt an electrical current when the current exceeds a predetermined threshold.
A device that trips like a switch and opens the circuit when overloaded.
Switching device designed to protect an electric circuit from excessive current. It has the same action as a fuse, and many houses now have a circuit breaker between the incoming mains supply and the domestic circuits. Circuit breakers usually work by means of solenoids. Those at electricity-generating stations have to be specially designed to prevent dangerous arcing (the release of luminous discharge) when the high-voltage supply is switched off. They may use an air blast or oil immersion to quench the arc.
A switch that opens and cuts off the flow of current when the current exceeds a certain level. Circuit breakers are placed at critical points in circuits to protect against damage that could result from excessive current flow, which is typically caused by component failure. Circuit breakers are often used in place of fuses because they need only to be reset rather than replaced. Compare surge protector.

2. cutout


1. A part that is cut out or is intended to be cut out. cut-out
2. Something that has been cut out of a piece of paper, cloth, or other material is a cutout.

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