The following circuit breaker sizing calculator will show the difference in % to the load, voltage level in different countries and exact size of breaker in amperes.

Dec 3, 2025 · With our Breaker Size Calculator, you can easily determine the ideal breaker size for your needs, whether it’s for DC, AC Single-Phase, or AC Three-Phase systems.

To help everybody sizing these breakers out, we will explain how to determine the right size of a breaker. On top of that, we include a Circuit Breaker Size Calculator further on (just insert …

Our breaker size calculator allows you to estimate the breaker size you need to protect your electrical appliances while withstanding their load without using a breaker size chart.

Sep 19, 2025 · This comprehensive guide will teach you how to properly size circuit breakers, select appropriate wire sizes, and comply with National Electrical Code (NEC) requirements …

Aug 7, 2024 · To calculate the proper circuit breaker size, divide the adjusted power by the source voltage. What is a circuit breaker? A circuit breaker is a device that stops the flow of current in …

Jun 12, 2024 · Use this tool to determine the correct breaker size for your electrical needs quickly and accurately.

Learn how to size circuit breakers from load current or power, apply the NEC 80%/125% continuous-load rule, and use the Breaker Size Calculator above to check your work with …

Circuit breaker sizing calculator per NEC 240.4, 210.20 and 430.52 to select standard breaker sizes based on load current, conductor ampacity and protection rules.

The breaker size calculation determines the appropriate circuit breaker amperage needed to protect an electrical circuit. The 1.25 multiplier provides a safety margin to prevent nuisance …