What is a thermostatic relay? Structure & role of thermostatic relay

Relay is an extremely familiar electrical device used in electrical equipment such as air conditioners, refrigerators, etc. Please refer to the article with Tnhelearning.edu.vn to find the answer!

What is a thermostatic relay?

Air conditioner thermal relay , also known as another name, thermostatic relay (air conditioner) has the function of automatically closing and disconnecting the circuit when it sees signs of overload to protect and troubleshoot the above current. air conditioner (air conditioner).

Thermal relays operate on the principle of expansion of metal rods when heated and are widely used in large and small electrical systems, from industrial parks to households.

Structure of the thermostatic relay

It can be said that the air conditioner thermal relay has a not too complicated structure and is also very simple to use. A thermostatic relay has the following components:

1. Leverage.

2. Normally closed (NC) contact

3. Normally open (NO) contact.

4. Impact current adjustment screw.

5. Bimetallic bar.

6. Heating wire.

7. Lever.

8. Reset button.

Types of air conditioning thermal relays today

Air conditioning thermal relays are classified as follows:

• Based on user needs : single-pole thermal relay and two-pole thermal relay.
• Based on structure : relays are divided into open-type relays and closed-type relays.
• Based on the heating method : thermal relays are divided into three types of direct heating relays, indirect heating relays and mixed heating relays.

The role of the air conditioner relay

Relays have several important roles as follows:

• Protect the air conditioner from overload current, sudden rapid increase
• Thanks to the thermal relay, the parts in the air conditioner also operate more durable and stable .
• Extends the life of your air conditioner, reducing common problems (usually, thermal relays will be attached to fuses).

Note: Thermal relays need a certain amount of time (from a few seconds to several minutes) to switch on and off the circuit. Therefore, this device can only be used to protect the current from overload, not for short circuit. If you want to protect the air conditioner from short circuit, you need to add a circuit breaker to the electrical system.

Above is the information about the structure, classification and role of the thermostatic relay, please refer to it for useful information!