Various applications of 3 Socket Plugs


We can’t imagine our lives without plugs and sockets these days. Electricity has become an indispensable part of our lives and plugs and sockets are a medium to access it. Plugs and sockets work together by joining the source of power and device. Our homes run on them, from charging our smart devices to TVs, refrigerators, ACs, etc. However, certain devices require specific sockets and plugs.

What is a 3 socket plug?

3 socket plug (ปลั๊ก สาม ตา, which is the term in Thai) or 3 pin plug has the following pins:  

  • A live pin: The current or electricity is supplied mainly through this pin from the plug to the device. 
  • A neutral pin: This works in the opposite direction of the live pin. This is the return path of the device to the outlet. 
  • The earth pin: This is important as it protects the users by earthing the device. The device’s metallic body is connected to the earthing of the power outlet. This then transfers the harmful current to the ground.

These plugs differ from 2 pin plugs significantly. 2 socket plugs have only a live pin and a neutral pin. The maximum amps these plugs can handle are 6. Class II electronic devices such as TVs, DVD players, etc. use such plugs. As these devices run on low current, they do not need to be grounded. Usually, 3 socket plugs can handle up to 13 Amperes (A) of current in total. There are different types of 3 socket plugs like 3-rectangular-pin plug and 3-round-pin plug. Each has its uses.

What are they used for?

These power socket outlet (ปลั๊ก ต่อ พ่วง, term in Thai) have the following uses:

  • They are used for double insulation. Earthing is important for large and powerful devices and safety. This helps in preventing users from getting electrocuted or shocked. 
  • 3-rectangular-pin is generally used for electronic devices, classified as class III devices, such as microwave ovens, fridges, and other metal bodies of electricity. These metal bodies run the risk of electricity leakage and these pins ensure that the device is earthed and insulated.
  • 3-round-pin plugs are used for heavier appliances like ACs, washing machines, etc. They provide better protection of the devices and users than the rectangular pin. These plugs tend to be bigger and the ground pin is thicker.

When you are building a house our buying essential electronic devices, make sure that your house has a 3 socket plug connection. This reduces the risk of load shedding or short circuits.