Motor breaker & cable sizing
Motor power → full-load current, min cable ampacity, overload relay setting, starting breaker size.
How to use
- Enter the calculation conditions
Enter the dimensions, loads, speeds or operating conditions requested by the form.
- Run the calculation
The tool applies the formulas shown on this page to the entered values.
- Review the result
Review the resulting specification and checks, then verify them against the cited source, current standard and real operating conditions before use.
Core formula
FLC = P / (√3 · U · cosφ · η)
Example using default values
FLC = 3,000 / (√3 · 380 · 0.85 · 0.9) = 6 A
Source: IEC 60947-2/-4-1; IEC 60364-5-52.
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