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Type B power plug diagram
NEMA 5-15Three-prongAmerican grounded plug

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.

⏚ Grounded100-127V60Hz3 Pins15A

Technical Specifications

Pin Shape
Flat parallel blades with round grounding pin
Number of Pins
3
Grounded
Yes
Voltage
100-127V
Frequency
60Hz
Max Amperage
15A

Pin Dimensions

pin Length18.3mm
pin Width6.3mm
pin Thickness1.5mm
pin Spacing12.7mm
grounding Pin Length4.8mm
grounding Pin Diameter4.8mm

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

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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