In secondary current injection testing, a strong current is inserted directly into a trip relay to test a circuit breaker. Current injection is a testing process used to test the insulation of an electrical safeguard like a circuit breaker, a power surge is sent into the device, revealing possible trip failures. Secondary injection refers to the location the test is conducted, a secondary current injection occurs right where the trip unit is located. Secondary current injection test sets do not test the wiring or current sensors in a circuit breakers, instead focus solely on trip unit operation.
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