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What is the difference between a Form B and B2 for a starter, NEMA sizes 0 through 2?

The Form B is for an ambient compensated bi-metallic overload relay (with a red adjustment knob) vs. a B2 for a non-compensated overload ( with a white knob) . The ambient compensated type is used where the controller is located in an area with a widely varying temperature and the motor is in an area (like a submersible pump well) that is constant.

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