When the motor jams, the first thing to do is cut off the power to ensure safety

There are mainly the following reasons for cutting off the power first when the motor jams:
Prevent motor damage: A jammed motor indicates that there may be problems with its internal rotating components, such as bearing failures, friction between the rotor and the stator, etc. If the power is not cut off, the motor will still be energized and try to operate. At this time, the current will increase sharply, which may cause the motor windings to overheat and even burn out the motor.
Avoid safety accidents: After the motor jams, the mechanical components connected to it may also stop moving or experience abnormal vibrations. If the power is not cut off, these components may become loose or fall off due to abnormal stress or movement, thus causing mechanical injuries. In addition, overheating of the motor may also trigger safety accidents such as fires, posing a serious threat to personnel and equipment.
Protect other electrical equipment: The abnormal increase in current caused by the motor jam may affect other electrical equipment in the same circuit, subjecting them to excessive voltage or current, thus shortening their service life or even causing damage. Cutting off the power can promptly cut off the source of the fault and protect the stable operation of the entire electrical system.