Outlet Type O: need a travel adapter or not?

Heading to Thailand? You’ll quickly notice they use the Type O outlet there, a unique design developed specifically for the country.

This outlet is specifically designed for a three-pronged, grounded plug with two round, parallel pins and a longer grounding pin.

Features of Type O Outlet

Type O plugs are recognizable by their round pins and are designed to fit securely and safely into the outlet.

Number of pins	3
Grounded	Yes
Voltage	220 – 240 volts
Ampere	16 amps
Other types of plugs that fit	Type C, E, and F (strongly discouraged!)
Other outlets compatible with Type F	None
Need a travel adapter?	Yes

Type O outlets and plugs are rated for up to 16 amps and operate on a voltage range of 220 to 240 volts.

Click here if you need a travel adapter for Type O

Travel adapter for type O

Dimensions

The power pins have a diameter of 4.8 millimeters and a length of 19 millimeters, while the grounding pin is 21.4 millimeters long.

The distance between the power pins is 19 millimeters, and the grounding pin is centrally aligned, 11.9 millimeters vertically from the line connecting the two power pins.

Using Type O Plug

The Type O outlet is designed exclusively for Type O plugs. While Type C, E and F plugs may physically fit, their use is dangerous and therefore not recommended.

Type O outlets are used only in Thailand, alongside a variant that also accepts Type A, B, and C plugs.

So, you’ll only encounter Type O outlets in Thailand. If you’re not sure whether your devices are compatible with these outlets, use a suitable travel adapter or check the information on this website using the search function (top right).

The Necessity of a Travel Adapter

Yes, it is highly recommended to bring a suitable travel adapter that is compatible with Type O outlets to avoid any risks.

Without the right adapter, you may encounter problems such as being unable to charge your devices, damaging your charger, and in extreme cases, even causing short circuits, electrical shocks, or fire hazards. Naturally, you want to avoid these issues!