Motor Protection Fuse & Circuit Breaker Selector – Determine the Correct MCB, MCCB or Fuse Rating

Use this free Motor Protection Calculator to quickly determine the correct MCB, MCCB or fuse rating for any AC motor application. By entering your motor power, voltage, phase type and starting method, this tool automatically calculates the required full-load current and suggests the next standard protection device rating.

Why Correct Motor Protection Sizing Matters

Correctly sizing your circuit protection prevents nuisance tripping, ensures reliable motor starting and protects wiring, switchgear and motors from overload and short-circuit faults. This tool provides a fast, engineering-based recommendation aligned with IEC and BS standards.

• ⚡ Prevents false trips during startup
• 🔌 Ensures optimal breaker coordination
• 🛡️ Protects motor windings and cables
• 📈 Meets compliance with IEC 60947 & BS EN 60898 standards

How to Use the Calculator

• ✅ Enter the motor power (kW) from the nameplate
• 🔋 Select the voltage (230V, 400V, 415V or 690V)
• ⚙️ Choose the phase type and starting method
• 🔧 Select your protection device type (MCB, MCCB or fuse)
• 🧮 Click Calculate to view the recommended protection size

Typical Applications

• ✅ Direct-On-Line (DOL) Motor Starters
• ⚙️ Star-Delta Starter Circuits
• 💡 VFD-Fed Motors and Inverter Drives
• 🏗️ Control Panels and Automation Systems

Need Help Choosing the Correct Device?

We supply a full range of MCBs, MCCBs, and Industrial Fuses from trusted brands like ABB, Schneider, Allen Bradley, Siemens and Eaton — all with 2-year warranty and fast UK delivery.

📞 Need help? Contact Drive Outlet Megastore today.

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Drive Outlet Megastore is the UK’s leading supplier of industrial automation calculators and OEM components — helping engineers and maintenance teams make quick, accurate equipment choices every time.