This standard applies to all types of electrically controlled indoor and outdoor power circuit breakers@ including circuit breakers in switchgear cubicles and in metal-clad switchgear@ having an interrupting rating of 50 megavolt-amperes (mva) or higher and a voltage rating above 1500 volts. This standard applies for any source of circuit breaker operating energy@ such as solenoid@ motor@ spring@ compressed gas@ etc@ for any type of operating mechanism and for both a-c and d-c control power.