Circuit Breaker Calculator

Quickly calculate the right circuit breaker size for your electrical load.

Load data input

Phase Type

Power

Voltage Type

Voltage

Power Factor

Cos θ

Load Type

Safety Factor

Calculation Results

Load Current

I (A)

–

Breaker Current

I_cb (A)

–

Rated Breaker

Recommended Breaker (A)

–

Disclaimer: This calculator provides approximate values for planning purposes only. Always verify results against relevant standards and consult a licensed electrical professional before installation.