Circuit Breaker Size Calculator

v1.0

Calculate the correct circuit breaker size for a continuous load using the NEC 125% rule.

Electrical Engineering Suite

Circuit Breaker Size Calculator

Load Input

NEC Article 210.20 requires breakers sized at 125% of continuous load.

Recommended Breaker

Standard Breaker Size

20A

Required Rating: 20.00A (125% Rule)

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Discover how Circuit Breaker Size Calculator executes your workflow locally in your browser with zero server uploads and total privacy.

Circuit Breaker Size Calculator on Neranjan Tools is an ultra-fast, client-side utility crafted to deliver professional-grade processing without the privacy risks or upload delays of traditional cloud services. Whether handling sensitive business contracts, personal photos, or code snippets, you can accomplish your task in seconds.

Unlike conventional web converters that upload your confidential files to remote third-party servers, this tool operates 100% inside your browser's local sandbox using HTML5 Canvas, WebAssembly, and modern JavaScript engines. Your files are loaded into your device's memory, processed instantly by your local CPU and GPU, and saved directly to your disk, ensuring zero data leaks, zero server logging, and immunity to malware execution.

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NEC Article 210.20 requires breakers serving continuous loads (3+ hours) to be sized at 125% of the load current to prevent nuisance tripping and overheating.
Common standard breaker sizes include 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, and 200 amps.
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