Best type O plug adapter
Everything you need to know about type O plugs: technical specifications, countries of use, and compatibility with other plug types.
Type O
Thai plug
Compatible with Type C
Technical specifications
Thai plug with 3 round pins and grounding
Voltage and frequency
Voltage and frequency in countries using type O plugs
Voltage
Frequency
How to use a type O adapter
Check compatibility
Before your trip, check that your devices support the voltage and frequency of the destination country.
Buy an adapter
Get a quality type O plug adapter. Choose a universal adapter for greater versatility.
Plug in safely
First insert the adapter into the wall socket, then plug your device into the adapter.
Check operation
Make sure your device works properly. If you notice overheating, unplug immediately.
Other plug types
These plug types are often found in the same countries as the type O plug
Comparison with compatible types
Type O | Type A | Type B | Type C | Type F | |
|---|---|---|---|---|---|
| Pins | 3 round pins | 2 flat pins | 2 flat + 1 ground | 2 round pins | 2 round + ground clips |
| Ground | Grounded | No ground | Grounded | No ground | Grounded |
| Amperage | 16A | 15A | 15A | 2.5A | 16A |
| Countries | 1 | 63 | 53 | 150 | 74 |
Did you know?
The type O plug is the Thai standard.
Thailand is the main country using this plug type.
It is compatible with type C plugs and also accepts types A and B.
Safety tips
Check the voltage
Make sure your devices support the local voltage. Use a converter if necessary.
Avoid stacking adapters
Never stack multiple adapters. This increases the risk of overheating and short circuits.
Choose quality
Choose a certified adapter with surge protection to protect your electronic devices.
Adapter vs Converter: what's the difference?
Adapter
Only changes the plug shape. It allows you to plug your device into a differently shaped socket, without modifying the electrical current.
Converter
Changes the electrical voltage (e.g. 220V → 110V). Required if your devices don't support the destination country's voltage.
Most modern chargers (phone, laptop) are multi-voltage (100-240V) and only need an adapter.
Travel checklist
Everything about the type O plug
What is a type O plug?
Thai plug with 3 round pins and grounding
Which countries use type O plugs?
The type O plug is used in 1 countries worldwide, including Thailand. This standard is widespread across multiple regions and it is recommended to check your device compatibility before traveling to these countries.
Which adapter should I buy for a type O plug?
A universal adapter is recommended for type O plugs. It will allow you to plug in your devices in all countries using this standard.
What is the name of a type O plug?
The type O plug is commonly known as "Thai plug".
How to recognize a type O plug?
The type O plug (Thai plug) can be identified by its grounding pin, which provides enhanced electrical safety. It supports a current of 16A and is used in 1 countries worldwide.
Last updated: February 2026