How to Calculate MCB Size for Any Load | Circuit Breaker Selection Formula
Learn how to calculate the correct MCB rating for your home electrical load using simple formulas. In this video, I explain the complete process of circuit breaker selection.
In this video, you'll learn the exact formula to calculate MCB (Miniature Circuit Breaker) rating for any single-phase or three-phase electrical load — step by step. Whether you're wiring a house, workshop, or panel board, this guide makes breaker selection easy and safe.
📐 MCB SELECTION FORMULA:
Current (A) = Power (W) ÷ [Voltage (V) × Power Factor]
→ Then choose MCB rated at 125% of calculated current
🔢 QUICK MCB SIZE REFERENCE:
• 6A MCB → up to 800W
• 10A MCB → up to 1500W
• 16A MCB → up to 2500W
• 20A MCB → up to 4000W
• 32A MCB → up to 6400W
⏱️ CHAPTERS:
00:00 – Introduction & what you'll learn
00:30 – What is an MCB and why rating matters
01:30 – MCB calculation formula (step-by-step)
03:00 – Single phase load calculation example
05:00 – House wiring practical example
07:00 – How to read MCB ampere ratings
09:00 – Common mistakes that cause breaker trips
10:30 – Summary & safety tips
✅ WHAT YOU'LL LEARN:
→ MCB rating calculation formula
→ How to calculate total load in amperes
→ Correct breaker size for home wiring
→ Difference between 6A, 10A, 16A, 20A, 32A MCBs
→ How to avoid short circuit and overloading
⚠️ SAFETY NOTE: Always switch off the main supply before working on any electrical panel. If unsure, consult a licensed electrician.
💬 Drop your total home wattage in the comments — I'll help you pick the right MCB!
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