| 摘要 |
A power wrench includes a body, a connecting element, a drive motor and a protection circuit. The connecting element is axially rotatably disposed inside the body and protrudes out of the body. The drive motor is for rotating the connecting element. The protection circuit is for controlling a power supply of the drive motor according to a value of a drive current of the drive motor. When the drive current of the drive motor is over a critical current value, the power supply of the drive motor is cut off.
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