| 摘要 |
<p>An actuator for a circuit breaker at or near a pole top, including an electric motor and gear box drive assembly which is operable to provide output drive from the gear box to a circuit breaker either by operation of the electric motor or manually, including an electric motor and a step-down gear box movably mounted relative to one another such that the motor drive is in one relative position between the motor and the gear box connected through the gear box to an output drive from the gear box, and is in another relative position between the motor and the gear box disconnected through the gear box, and a manual drive shaft to the gear box which can be manually rotated to provide output drive from the gear box at least when the motor is disconnected from the output shaft from the gear box, without back driving the electric motor.</p> |
