The TCM is a convenient panel - mounted relay that provides continuous monitoring of trip coils and 52B auxiliary contacts utilizing 3 bi - color LEDs for visual indication of trip coil and breaker position status for each phase. Green indicates the breaker is open; red indicates it is closed.
If any LED is off, it indicates a failed trip coil phase or loss of power to that trip coil. If all LEDs are off, it most likely indicates a loss of power.
An integrated alarm time delay circuit eliminates nuisance alarms when a trip coil opens, loses power, or while the breaker is completing its trip operation.
The TCM monitors the individual phases from each trip coil power supply, thereby meeting the Northeast Power Coordinating Council's requirements for the monitoring of single - pole tripping to ensure proper breaker operation should there be a single trip coil failure.