TYPE O / EXPLAINED
How to recognize Type O
Type O is the Thai three-round-pin configuration. Its earth contact is spaced differently from the superficially similar J and N patterns. The dedicated Type O drawing is more useful for identification than a photograph of a general-purpose multi-standard socket.
- Common regions
- Thailand
- Contact arrangement
- Three round pins in a distinct triangular arrangement
- Common current variants
- 16 A
- Typical supply voltage
- Commonly 220–230 V
- Standard family
- TIS 166-2549 family
- Socket accepts
- O and suitable C plugs; hybrid sockets require separate identification
Earthing, compatibility & common mix-ups
Thailand also has many hybrid socket products with additional openings for other plug shapes. Those extra openings do not define the dedicated Type O interface or guarantee an earth connection for an E/F plug. Identify the exact hybrid design and approved combinations before describing its compatibility.
What the type letter tells you
The letter describes a recognizable connection family. It does not specify the complete wall plate, mounting box, shutters, terminal design or approval for a destination market. A plug's rated voltage is also different from the actual supply voltage at a location. An adapter changes the physical connection; it does not convert voltage or frequency.
Choosing a Type O socket for your market
Start with the destination country and the appliance connection you need to support. Then identify the exact national version within TIS 166-2549 family, its marked current and voltage, and its earthing arrangement. The figures above describe common configurations; the supplied product's marking and technical documents define the actual model.
- Compare the complete contact pattern with the reference image, including the earth contact.
- Confirm the local supply voltage and frequency against the appliance input label.
- For a buying enquiry, include mounting format, current variant, quantity and required market documents.
Does physical fit mean the connection is suitable?
No. The earth connection, contact pressure, current rating, supply voltage and approved configuration all matter. Do not force a plug into a socket or remove an earth contact.
Reference image and initial type data: supplied global plug-and-socket workbook. Country context checked against Bel's World Plug and Input Voltage Guide. For South African configurations, see Interpower's SANS 164-2 guide. These recognition notes do not replace the applicable national standard or product documentation.