PlugVoltage
Type O · Socket front · schematic, not to scale
Socket front · schematic, not to scale

Plug Types Type O

Type O plug & sockets

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.

Grounding
Grounded
Countries in our data
1
Check your device
A plug that fits is not proof of safe use. Check your device’s INPUT label and the destination voltage before plugging in.

Where Type O is used

1
Explore countries

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.

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.

Do Type O plugs fit other sockets?

A Type O plug normally fits only a Type O socket; bring a dedicated adapter if needed. Physical fit does not convert voltage.

Choosing an adapter

If your plug does not fit Type O, you need a plug adapter. An adapter does not change voltage.

Shopping link

External shopping link. PlugVoltage is not currently earning from this link.

Find a Type O travel adapter(opens in a 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.

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.