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 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.


Makel Thermal Relays have many varied fields of application.
Thermal relays are electrical switch products which protect the electrical circuit they are attached to from excessive currents. They are produce in compliance with the international IEC 60947-4-1 and TS EN 60947-4-1 standards and the ISO 9001:2000 management system and are CE and RoHS certified. The bimetal material in thermal relays heats up and show mechanical change when the electrical equipment the relays are attached to are exposed to excessive currents, one of the phases breaks away and the equipment malfunctions. As a result of this change the thermal relays cut off conduction. Through auxiliary contact exits the relays ensure that the circuit of the control contactor they are attached to is cut off as well. The thermal relays are manufactured in various nominal currents from 0.16 A to 50 A. Makel Thermal Relays are easily attached and detached with DIN rail accessories. Also easy assembly and connection flexibility is provided with the DIN rail accessories for the thermal relays. The thermal relays work with full efficiency in ambient temperatures between -5°C and 55°C and are mounted on panels using bolts or standard 35 mm DIN rails. The thermal relays are resistant to 1000 V voltage with the raw materials that are used. Thermal relays are produced in a variety of nominal currents from 0.16 to 95 A

  • 1NA +1NK auxiliary contact
  • Easy assembly
  • Bimetal opening feature
  • Phase line protection
  • Release display
  • Current setting
  • Automatic and manual reset button
  • Test and stop button
  • Unaffected by motor starting
  • Mountable on DIN rail with the help of an electrical terminal block
  • Useful Life: 10 years

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