Type O Plug 3 pins
TIS 166-2549 (Thai)
The Type O plug has three round pins with insulated sleeves in a triangular arrangement. It is an earthed 220-240V, 50 Hz plug and is used exclusively in Thailand.
What Does a Type O Plug Look Like?
The Type O plug has three round pins, each often with an insulated sleeve near the base, arranged in a triangular pattern. It is an earthed design and the pins are typically thicker and spaced slightly wider than many European plugs. You can recognise it by the three rounded pins and the visible insulation sleeves on the live and neutral pins.
Where Is the Type O Plug Used?
Type O is used exclusively in Thailand and was introduced as the national standard there. In practice Type O sockets in homes, hotels and public places are often hybrid designs that can accept other plug types. On the provided list Thailand is the only country noted, and the socket is commonly encountered there as a secondary or hybrid outlet alongside older sockets.
Which Plugs Fit a Type O Socket?
Type O sockets are hybrid in design, and the data shows they accept Type C plugs. According to the visitor compatibility table, European plugs (C/F/E) and Indian plugs (D/C) fit Type O sockets, while plugs from the US and Canada (A/B), the UK (G), Australia and New Zealand (I) and Japan (A/B) do not. Practical fit may vary with individual wall plates.
| Travelling from | Your plugs | Fits a Type O socket? |
|---|---|---|
| US & Canada | Type A/B | No, bring an adapter |
| UK & Ireland | Type G | No, bring an adapter |
| Europe | Type C/F/E | Yes, no adapter |
| Australia & NZ | Type I | No, bring an adapter |
| India | Type D/C | Yes, no adapter |
| Japan | Type A/B | No, bring an adapter |
Travel Adapters for Type O Sockets
Visitors from the US, Canada, the UK, Australia, New Zealand and Japan will generally need a plug adapter to connect to Type O sockets; travellers from Europe and India may not need one for devices with compatible plugs. Use a three-pin earthed adapter that matches the local hybrid faceplate when possible. Check the voltage before use: many phone and laptop chargers are dual-voltage, but single-voltage appliances like some hair dryers will need a voltage converter.