There is no "heating relay" this term, for a line for a relay function is to control the heating device, so called the heating relay
There is also a saying that a line requires overload protection, need to add a thermal relay.
The following explains what is a thermal relay:
Thermal relay is generated by the heat into the heat element heat, so that different expansion coefficient of bimetal deformation occurs, when the deformation reaches a certain distance, it will promote the linkage action, so that the control circuit is broken, so that contactor power failure, The main circuit is disconnected to achieve overload protection of the motor. Relay as the motor overload protection components, with its small size, simple structure, low cost advantages in the production has been widely used.
The role of thermal relay is: mainly used for overload protection of the asynchronous motor, his working principle is the overload current through the thermal components, the bimetal heating bending to promote the action mechanism to drive the contact action, so the motor control circuit off Open to achieve the motor power stop, play the role of overload protection. In view of the bimetallic heating process, the heat transfer takes a long time, so the thermal relay can not be used for short circuit protection, but can only be used as overload protection
You should be talking about thermal relay, or is a relay control of a heating device, so this relay is called heating relay.
The working principle of the thermal relay is caused by the heat flowing into the heat element, so that the bimetal with different expansion coefficient is deformed. When the deformation reaches a certain distance, the connecting rod is pushed to make the control circuit open, so that the contactor Power failure, the main circuit off, to achieve the motor overload protection.
1, mainly used for overload protection of the asynchronous motor, the working principle is the overload current through the thermal components, the bimetal heating to bend the action to promote the action mechanism to drive the contact action, so the motor control circuit to disconnect the motor to achieve power off , Play the role of overload protection.
2, in view of the bimetallic heating process, the heat transfer takes a long time, therefore, thermal relay can not be used for short circuit protection, but can only be used as overload protection thermal relay overload protection.
