The maximum 60hz voltage that can be applied to a switch for one minute without causing insulation failure is known as the phase failure.
A phase loss fault is the condition caused by blown fuses, tripped circuit breakers, cable damage, open circuits, poor/loose connections and worn contacts. Allowing this fault to persist can lead to equipment failures and machine downtime.
A phase failure relay which is also known as phase protection relay prevents three-phase motor failure due to line or motor overheating. The relays are designed to protect the devices with sensitive operation voltage against failures due to line voltage.
Learn more about phase failure here:
