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Circuit Breaker Sizing

Calculate Circuit Breaker Sizing instantly with the exact formula and a worked example.

Circuit Breaker Sizing

Load current, AA
Breaker rating
20A
Calculate Circuit Breaker Sizing instantly with the exact formula and a worked example.

More about: Circuit Breaker Sizing

What it calculates

The “Circuit Breaker Sizing” calculator computes Breaker rating in A from 1 parameter: load current, a (A).

A standard physics formula used in educational and engineering tasks.

Example calculation

With parameters Load current, A = 16 A the result is 20 A.

How to use

  1. Enter load current, a — each field above is adjustable with a slider.
  2. Breaker rating (A) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is Circuit Breaker Sizing calculated?
The Circuit Breaker Sizing calculator computes Breaker rating (in A) from load current, a. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Circuit Breaker Sizing calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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