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Crowbar circuit is use for protecting the sensitive load from high voltages or faults. Crowbar circuit is also called as overvoltage protection circuit.
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Crowbar

(1) A triggered, shunt device that diverts the stored energy of the beam power supply.


(2) Circuit used to protect the output of a source from a short circuited load. Load current is limited to a value the source can deliver without damage.

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