Adjusted design current
66 A
Design current after applying duty assumptions, spare margin, and derating.
Calculator preliminar
Breaker selection calculator
Select a preliminary breaker rating using design current, load duty, ambient derating, spare margin, and inrush awareness.
Assumptions used by this calculator
- This is a preliminary breaker-rating workflow and does not replace code-specific protection coordination.
- Continuous and motor duty use a basic planning multiplier before rounding to the next standard rating.
- High inrush loads still require curve and settings verification before procurement or energization.
Minimum standard breaker
50 A
Smallest standard breaker at or above the entered design current.
Recommended breaker
80 A
Rounded preliminary breaker rating from the adjusted design current.
Engineering note
Review
Use this as a preliminary rating only. Final coordination and code checks are still required.