CB Selection Guide
Circuit Breaker Selection Guide
Circuit Breaker selection guide — enter load current and short circuit current (Isc) to get suitable CB type (MCB, MCCB, ACB) suggestion. Includes breaking capacity, trip curve, and brand comparison.
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Excel
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How to Use
Follow these simple steps to get started
Enter load current (Amp)
Enter prospective short circuit current (kA)
Select application type (Distribution, Motor, Lighting)
View recommended CB type, rating, and trip curve
View brand comparison chart
Tool Preview
Screenshot will be shown here
Who Needs This
Frequently Asked Questions
MCB (Miniature) = low current, MCCB (Molded Case) = medium, ACB (Air Circuit Breaker) = high current application.
B = resistive load, C = general purpose, D = motor/inrush current. The tool auto suggests.
Must be higher than prospective Isc. The tool auto suggests.
Schneider, ABB, Siemens, LS — all are good. The tool includes price-performance comparison.
Motor starting current (6-8x rated) requires D-curve or motor protection CB.
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