Power device for continuously detecting entry and exit positions

A power device for continuously detecting each of extended and retracted positions of a circuit breaker body and for linearly detecting a position of the circuit breaker body, the power device comprising:

• a cradle having a cradle terminal;
• the circuit breaker body configured to mechanically and electrically connected to or disconnected from the cradle terminal;
• a girder and a truck as a transporting means for moving the circuit breaker body to a contact position with cradle terminal or disconnection position from the cradle terminal;
• a position detected area portion formed on at least one of both opposing side faces of the circuit breaker body;
• and
• a sensor module fixed to at least one of both opposing inner side faces of the cradle, wherein the sensor module includes at least one sensor facing the position detected area portion so to detect a displaced position of the position detected area portion and thus to detect a position of the circuit breaker body, based on the detected displaced position,
• wherein the position detection area portion has a length proportional to a moving distance of the truck to detect a linear position of the circuit breaker body over an entirety of a movement range of the circuit breaker body.