When a motor is locked or overloaded, winding temperature and circuit current can change quickly. A protector with bimetal and heating structures can disconnect the circuit under abnormal conditions and reduce overheating risk. Rated current, locked-rotor current, trip time and mounting position should be provided for selection.
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Application Note
Key Points for Motor Protectors Under Locked-Rotor and Overload Conditions
Motor protectors need to account for both temperature rise and current changes in window motors, wiper motors, pumps and small appliance motors.