O Thai plug

Three round pins, earth below – the Thai standard, usually in sockets that also take other plugs.

Standard: TIS 166-2549
Current: 16 A
Voltage: 220–240 V
Earth: yes
Pins: 3

Type O (TIS 166-2549) has been the official Thai standard since 2006. It resembles a Schuko plug with an extra round earth pin. In practice many Thai sockets are combined 'universal' outlets that accept type A, B and C plugs as well, though older buildings may have only two-pin sockets without earth. The sockets accept Europlugs.

What it looks like

Two round pins 4.8 mm thick, 19 mm apart, with a round earth pin centred below them.

The drawings are schematic – they show the pin layout, not the exact dimensions of the standard.

Plugs that fit a type O socket

A type O plug also fits

Only sockets of its own type – elsewhere you need an adapter.

Where it is used 1

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the most common type in the country (1)
one of the types in use (0)

Thailand