Breaker Size Calculator
Estimate a breaker rating range using explicit load-current rules.
These estimates are for preliminary planning. Verify the design against local codes, installation conditions and protection coordination.
Preliminary / reference only
Calculation Basis
The quotation range uses 1.00 to 1.25 times the load current, rounded up to the next reference ratings. Check motor starting, trip curves, cable ampacity and prospective fault current for the actual installation.
Electrical Installation Guide