Type O Plug & Sockets
Type O — Thai three round pins.
Type O at a glance
| Plug code | Type O |
|---|---|
| Grounded | Yes — has an earth contact |
| Typical voltage world | 220–240V (Europe, most of Asia/Africa) |
| Fits these sockets | Type O |
| Used in (countries) | 1 |
What a Type O plug is
Thailand's own three-round-pin standard. Sockets often also accept Type A/B/C, but the grounded Type O plug fits only a Type O socket.
Remember: the plug shape says nothing about the voltage. A Type A plug fits sockets in both the US (120V) and Japan (100V); a Type C plug fits 220–240V sockets across Europe and much of Asia. Always check the voltage of your destination before plugging in a single-voltage device.
Countries that use Type O sockets
What adapter to buy
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Get a Type O travel adapter(opens in new tab)Safety check: a plug adapter only changes plug shape. It does not convert voltage, so confirm your device label before buying.
Shopping links never change the safety verdict.
Type O FAQ
What does a Type O plug look like?
Thailand's own three-round-pin standard. Sockets often also accept Type A/B/C, but the grounded Type O plug fits only a Type O socket.
Which countries use Type O sockets?
Type O sockets are used in Thailand. Always confirm the local voltage — the plug shape alone never tells you whether your device is safe.
Do Type O plugs fit other sockets?
No. A Type O plug fits only Type O sockets — bring a dedicated adapter.
Standards reference framework
These IEC publications define the reference framework used to interpret nominal voltage and household plug/socket systems:
- IEC 60038: standard-voltage reference for nominal supply-voltage families.
- IEC TR 60083:2015: technical overview of plugs and socket-outlets used in IEC member countries.
- IEC 60884-1:2022: general safety and performance requirements for household plugs and socket-outlets.
These publications are reference standards, not proof of every live outlet. Country records still require current national, utility, or regional evidence and a visible review date.
Inspect country evidence. The public dataset separates primary, corroborated, partial, and pending claim coverage.
Plug types by country (full A–O guide) · Adapter vs converter
Guidance only — not professional electrical advice. Always confirm against your device's label before plugging in. Local wiring (especially in hotels and older buildings) can vary.