The invention relates to an
electric control brake closing and breaking device which comprises a casing, a motor, a variable-speed transmission mechanism and a main shaft, wherein the variable-speed transmission mechanism comprises a plurality of gear shafts which are connected sequentially, the motor is connected with the gear shafts through gears, the gear shafts are connected with an
electromagnetic clutch, the
electromagnetic clutch is connected with the main shaft, and the
electromagnetic clutch can switch the rotation direction of the main shaft; the casing is provided with a circuit board, and the circuit board is connected with the casing through an antivibration pad and a vibration reduction bracket; and the motor is connected with a safety switch. According to the invention, theplurality of gear shafts and the electromagnetic
clutch are adopted to form an overrun
clutch, and the speed changing, the moment increasing and moment direction transferring are realized; and the motor is connected with the safety switch, and the circuit can be
cut off automatically when the motor has an excessive load, thus the motor is protected. The
electric control brake closing and breakingdevice has the advantages of simple structure, large output torque,
low noise and no need of adjustment during the installation, is connected with the input shaft of a vacuum
circuit breaker, is safeand reliable to use, is convenient to operate, and is favorable for realizing the long-distance
automatic control of a high-
voltage power grid.