Circuit Breaker Calculator
Size a circuit breaker from load current with standard safety factors per NEC guidelines.
How to Use the Circuit Breaker Calculator
- Enter the total load current in amps.
- Set safety factor (1.25 for continuous loads).
- Enter circuit voltage.
- Get recommended standard breaker size.
使用场景
- •Residential panel design
- •Commercial circuit sizing
- •Electrical load planning
公式
Breaker ≥ Load × Safety Factor
常见问题
How accurate is this calculator?
Results are based on standard engineering formulas and are suitable for preliminary estimates.
What units are used?
SI units (metres, kg, kPa) are used unless otherwise noted.
Is it free?
Yes, all calculators are completely free.