Conductor size abb breaker

A very specific question!

The conductor size required for an ABB breaker depends on several factors, including:

1. The type of breaker: ABB offers various types of breakers, such as molded case circuit breakers (MCCBs), air circuit breakers (ACBs), and vacuum circuit breakers (VCBs).
2. The voltage rating: The voltage rating of the breaker affects the conductor size required. Higher voltage ratings require larger conductors.
3. The current rating: The current rating of the breaker determines the maximum amount of current that can flow through the breaker. Larger conductors are required for higher current ratings.
4. The ambient temperature: The ambient temperature where the breaker will be installed affects the conductor size required. Higher temperatures require larger conductors to ensure safe operation.

Here are some general guidelines for conductor sizes for ABB breakers:

• For molded case circuit breakers (MCCBs):
  • 1-3 kV: 10-20 AWG (2.5-5 mm²) conductors
  • 3.3-6.6 kV: 8-16 AWG (4-10 mm²) conductors
  • 6.6-12 kV: 6-14 AWG (10-20 mm²) conductors
• For air circuit breakers (ACBs):
  • 1-3 kV: 8-16 AWG (4-10 mm²) conductors
  • 3.3-6.6 kV: 6-14 AWG (10-20 mm²) conductors
  • 6.6-12 kV: 4-12 AWG (20-25 mm²) conductors
• For vacuum circuit breakers (VCBs):
  • 1-3 kV: 6-14 AWG (10-20 mm²) conductors
  • 3.3-6.6 kV: 4-12 AWG (20-25 mm²) conductors
  • 6.6-12 kV: 2-10 AWG (25-40 mm²) conductors

Please note that these are general guidelines and the actual conductor size required may vary depending on the specific application and installation requirements. It is recommended to consult the ABB breaker datasheet and follow the manufacturer's recommendations for conductor sizing.