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The Allen-Bradley SMP-1 overload relay operates by monitoring the current flowing through the motor circuit. It uses a bimetallic element that heats up as current increases, bending and eventually tripping the relay when the set overload threshold is reached. This action disconnects the motor from the power supply to prevent damage due to overheating. The SMP-1 is designed for easy reset and can be adjusted for different trip settings to accommodate various motor specifications.
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