Thailand Type O Travel Adapter (TIS 166-2549)
Thailand's modern grounded plug has two round power pins and a third grounding pin. It is known as the Type O plug.
A Thailand Type O travel adapter, also spelled Thailand Type O travel adaptor or TIS 166-2549 adaptor plug, changes the plug shape only. It does not convert voltage.
Thailand Type O Travel Adapter Quick Facts
- Two round power pins and a third grounding pin
- Grounded plug and outlet system
- Defined by Thailand's TIS 166-2549 standard
- Thailand typically uses 220–240V / 50Hz electricity
- A Thailand plug adapter changes the plug shape only
What Plug and Travel Adapter Do I Need for Thailand?
USA Type A and Europe Type C plugs are the types travelers most commonly encounter in Thailand. Type A has two flat pins, while Type C has two round pins. USA Type B grounded plugs are also supported by many Thai hybrid sockets, though Type B is becoming less common. Thailand's Type O grounded standard, with two round power pins and a third grounding pin, is common in newer electrical installations.
Because many Thai outlets are designed to accept more than one plug type, travelers may encounter sockets compatible with Type A, Type B, Type C, or Type O plugs.
For complete country information, see the Thailand plug and adapter guide.
Countries Where Type O Is Encountered
Type O is used in Thailand. Adapter is also spelled adaptor, and grounded is also described as earthed.
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