Type D (BS 546) - The Indian Mains Plug
Three large round pins arranged in a triangle - the British colonial-era plug still standard in India and parts of Africa.
The Type D plug per BS 546 is one of the oldest mains plug designs still in active use. Three large round pins arranged in a triangle - the earth pin is noticeably thicker than line and neutral and engages first. Rated 5 A at 230 V; a 15 A variant (BS 546 Type M) exists with even thicker pins (see Type M). India is the largest user, with Sri Lanka, Nepal, Bhutan and parts of Africa following the same standard from the British colonial era.
Technical Specifications
| Standard | BS 546 |
| Rated current | 5 A (15 A variant = Type M) |
| Rated voltage | 230 V AC |
| Pins | 3 round (earth thicker) |
| Class | I |
| Countries | India, Sri Lanka, Nepal, Bhutan, parts of Africa |
Matching products in the shop
- Type D power cords
- India travel adapters
Frequently Asked Questions
Type D vs Type M - what is the difference?
Both are BS 546, but Type D is 5 A with thinner pins, Type M is 15 A with much thicker pins. Type D plug fits a Type M socket loosely (not recommended). Type M plug does not fit Type D socket.
Is Type D safe?
The pins are well shielded and the earth-first design is safe in principle. However, the original 1947 design predates modern shutter requirements - many older Indian sockets have no shutter. Newer installations follow IS 1293 with shutter.
What does Indian household use today?
Mixed: Type D for older heavy appliances, Type M for AC units and water heaters, Type C / Europlug compatibility for chargers and small electronics.
Related connectors in the glossary
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