Power Plug Type B

100–127 V • 60 Hz • Yes – has a third round pin for grounding.

Type B is the grounded version of Type A, with two flat parallel pins and an additional round grounding pin. Standardized as NEMA 5-15.

Key facts

Grounding: Yes – has a third round pin for grounding.
Voltage: 100–127 V
Frequency: 60 Hz

Where it’s used

USA, Canada, Mexico, Japan

History

Introduced as a safer upgrade to Type A. Now the most common plug type in North America.

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Frequently asked questions

Where is Type B used?: Type B sockets are common in USA, Canada, Mexico, Japan.
What voltage and frequency does Type B use?: Type B is rated for 100–127 V at 60 Hz.
Is the Type B plug grounded?: Yes – has a third round pin for grounding.