Best type B plug adapter
Everything you need to know about type B plugs: technical specifications, countries of use, and compatibility with other plug types.
Type B
US grounded plug
Compatible with Type A
Technical specifications
American plug with 3 pins and grounding
Voltage and frequency
Voltage and frequency in countries using type B plugs
Voltage
Frequency
How to use a type B adapter
Check compatibility
Before your trip, check that your devices support the voltage and frequency of the destination country.
Buy an adapter
Get a quality type B plug adapter. Choose a universal adapter for greater versatility.
Plug in safely
First insert the adapter into the wall socket, then plug your device into the adapter.
Check operation
Make sure your device works properly. If you notice overheating, unplug immediately.
Countries using type B plugs
53 countries around the world use this plug type
Other plug types
These plug types are often found in the same countries as the type B plug
Comparison with compatible types
Type B | Type A | Type C | Type F | Type G | |
|---|---|---|---|---|---|
| Pins | 2 flat + 1 ground | 2 flat pins | 2 round pins | 2 round + ground clips | 3 rectangular pins |
| Ground | Grounded | No ground | No ground | Grounded | Grounded |
| Amperage | 15A | 15A | 2.5A | 16A | 13A |
| Countries | 53 | 63 | 150 | 74 | 55 |
Did you know?
The type B plug is an evolution of type A with an additional grounding pin.
It is mandatory in new constructions in the United States and Canada.
The round grounding pin easily distinguishes it from other plug types.
Safety tips
Check the voltage
Make sure your devices support the local voltage. Use a converter if necessary.
Avoid stacking adapters
Never stack multiple adapters. This increases the risk of overheating and short circuits.
Choose quality
Choose a certified adapter with surge protection to protect your electronic devices.
Adapter vs Converter: what's the difference?
Adapter
Only changes the plug shape. It allows you to plug your device into a differently shaped socket, without modifying the electrical current.
Converter
Changes the electrical voltage (e.g. 220V → 110V). Required if your devices don't support the destination country's voltage.
Most modern chargers (phone, laptop) are multi-voltage (100-240V) and only need an adapter.
Travel checklist
Everything about the type B plug
What is a type B plug?
American plug with 3 pins and grounding
Which countries use type B plugs?
The type B plug is used in 53 countries worldwide, including American Samoa, Antigua and Barbuda, Aruba, Bahamas, Barbados. This standard is widespread across multiple regions and it is recommended to check your device compatibility before traveling to these countries.
Which adapter should I buy for a type B plug?
A universal adapter is recommended for type B plugs. It will allow you to plug in your devices in all countries using this standard.
What is the name of a type B plug?
The type B plug is commonly known as "US grounded plug".
How to recognize a type B plug?
The type B plug (US grounded plug) can be identified by its grounding pin, which provides enhanced electrical safety. It supports a current of 15A and is used in 53 countries worldwide.
Last updated: February 2026