Abstract: A lockable circuit breaker racking mechanism is provided with a breaker type detection mechanism preventing locking and removal of the key unless the correct breaker type has been installed. The same locking mechanism can also be used to secure the racking mechanism in the trip-free position.

Abstract: An under voltage trip device for low and medium voltage breakers is disclosed. A first power supply receives unregulated power from a control voltage supply which is rectified and regulated with portions of the power supply monitored by a processor. The output of the first power supply is supplied to a second power supply which allows pulsing modulating power to be supplied to a solenoid connected thereto. The current supplied to the solenoid is measured and calculated by the processor and stored therein as well as being compared to stored values, thereby determining solenoid armature position and predicting or warning of solenoid failure. Connected to the second power supply is a third power supply which operates in a voltage regulator supply mode and a switcher mode during start-up and continuous running operation respectively, such mode being controlled by the processor.

Abstract: An under voltage trip device for low and medium voltage breakers, a first power supply receives unregulated power from a control voltage supply, which is rectified and regulated with portions of the power supply monitored by a processor. The output of the first power supply is supplied to a second power supply which allows pulsing modulating power to be supplied to a solenoid connected thereto. The current supplied to the solenoid is measured so as to represent the solenoid armature position which is measured and calculated by a processor and stored therein as well as being compared to stored values, thereby determining solenoid armature position and predicting or warning of solenoid failure. Connected to the second power supply is a third power supply which operates in a voltage regulator supply mode and a switcher mode during start-up and continuous running operation respectively, such mode being controlled by the processor.