The contact input/output circuitry is another part of the digital relay which allows only partial automatic testing. For this reason, it may be appropriate to implement a routine trip check. Many digital relays provide a trip feature which allows the user to locally or remotely trip the relay. The trip check verifies the trip circuit wiring and the integrity of the trip coil. This trip command feature provides a convenient means of tripping the circuit breaker without the need to inject a simulated fault to the relay. If the relay is routinely operating for faults, the actual relay operations may be adequate verification of the relay input/output functions.