Philippines

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A Thermal Overload relay (TOR) is an electronic device to secure more Overload weight based on Thermal temperature that has a relay to diskonnect a control sequence such as direct online and Start delta to operate it usually using only push button Start / Stop.
Thermal Overload Relay work principle
The thermal Overload Relay works when the temperature inside the TOR is met, so this TOR has a set of maximum amper to do trip if the ampere has been fulfillled. In the TOR there is a Bimetal Element that becomes hot as the ampere load exceeds the ampere of the TOR settings.

It 's called Thermal, it' s easy, it 's like a cable that can only pass 5A but it' s 10A. It 'll heat. To close or open the contact that exists in the TOR.
Thermal Overload function
The thermal Overload Relay (TOR) serves as a more load-safe on an Online Direct control sequence or Star Delta, so the controlled motor will not burn when the load is overloaded.