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thermal relay - Motion & Drives Glossary

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thermal relay - Motion & Drives Glossary

Term : thermal relay

What is 'thermal relay'? What does 'thermal relay' mean?

Definition

A relay that opens or closes contacts with a bending mechanism as a result of the difference in the expansion coefficients of a bimetal, which is heated by the current. The thermal relay switches a magnetic contactor to protect a motor from overload. The thermal relay is combined with a magnetic contactor because it cannot switch the main circuit by itself. The operating point can be changed.

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