Circuit Breaker Sizing Calculator

Calculate the correct breaker size for a circuit based on connected load, voltage, and NEC safety factor.

W

Recommended Breaker

25 A

Actual Current Draw20.0 A
Design Current25.0 A

Recommended Breaker vs Total Connected Load

सूत्र देखें →

सूत्र

## Circuit Breaker Sizing **Amps = Watts / Volts** **Continuous load: multiply by 1.25** per NEC 210.20(A). Then round up to the next standard breaker size (15A, 20A, 30A, 40A, 50A, etc.).

हल किया गया उदाहरण

2,400W continuous load on 120V.

  1. 01Amps = 2400 / 120 = 20A
  2. 02Design amps = 20 x 1.25 = 25A
  3. 03Next standard size = 25A, or use 30A breaker