Type B
Type B is a three-pin grounded plug with two flat parallel blades and a round grounding pin. It's the standard grounded plug in North America and has largely replaced the ungrounded Type A for safety reasons.
Technical Specifications
Pin Dimensions
History
Type B was developed as a safer alternative to Type A, adding a grounding pin for protection against electrical faults. It became the standard for most household and commercial applications in the United States and Canada by the mid-20th century.
Safety Features
The grounding pin provides protection against electrical shock by directing fault current to the ground. Type B outlets are polarized, with one slot wider than the other, ensuring correct connection of live and neutral wires.
Compatibility
Type B outlets accept both Type A and Type B plugs. The grounding hole accommodates the Type B grounding pin while still allowing ungrounded Type A plugs to connect.
Travel Tips
- ✓Type B is the safest option in 120V countries - always use grounded plugs when available
- ✓Some older buildings may not have Type B outlets - check before traveling
- ✓Universal adapters should include a grounding connection for Type B compatibility
- ✓In Japan, Type B outlets are less common than Type A
Regions
Countries(31)
Other Plug Types
Frequently Asked Questions
What is a Type B power plug?
Type B is a three-pin grounded plug with two flat parallel blades and a round grounding pin. It's the standard grounded plug in North America and has largely replaced the ungrounded Type A for safety reasons.
Which countries use Type B plugs?
Type B plugs are used in 31+ countries, primarily in North America, Central America, Caribbean, Parts of South America, Parts of Asia. Popular countries include Bahamas, Barbados, Belize, Canada, Colombia.
Is Type B a grounded plug?
Yes, Type B is a grounded (earthed) plug with 3 pins, providing protection against electrical faults.
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