- The Makel Thermal Relays protect the motor by inactivating the motor through the contactor when there is an overload or one of the phases is cut off.
- Thermal relays are produced in accordance with TS EN 60947-4-1 standards, in 3kA short circuit breaker capacity in various nominal currents from 9A up to 95 A and CE and RoHS certified in compliance with the ISO 9001:2000 management system.
Thermal Relays for Contactors
- Thermal relays are produced in compensation against ambient temperatures and sensitive to phase loss. Compensated against ambient temperatures, thermal relays operate within limits without being affected by ambient temperatures (the thermal relays specified in the standard).
- In the event of one of the phase conductors detaching the motors are left to 2 phases and may draw more voltage than normal causing them to burn. To prevent this the thermal relays, which are sensitive to phase loss, open faster than usual when one of the phases is cut off to protect the motor.
- Auxiliary Contacts: The opener activates two contacts, one that closes and one that cuts off. The cut off contact inactivates the motor contact to cut off the power going to the motor whereas the closing contact is used for other purposes.
- Reset Button: Used in automatic and manual setting. In (A) automatic setting after the bimetals have cooled down the thermal relay automatically makes the contactor activated. In (M) manual setting the reset button must be pressed after the bimetals have cooled in order to reactivate the contactor.
- Test Button: Whether or not the motor contactor has been inactivated is checked by pressing the test button.
- Stop Button: Used to inactivate the motor contactor in emergency situations.