IEC 60034 / NEMA Electrical Tool • Motor Sizing & Protection Engine

Electric Motor Sizing & Protection Calculator

Determine standard IEC/NEMA motor frame ratings, compute Full Load Current (FLC), starting current surges, thermal derating factors, cable sizing, and protective circuit breakers.

Unit System:

MOTOR LOAD & APPLICATION PARAMETERS

Application Category

Required Shaft Power (kW)

Rated Speed (RPM)

Supply Voltage (V)

Phases

Frequency (Hz)

Starting Method

Enclosure Rating

Service Factor (SF)

Efficiency Class

Power Factor (cos φ)

Ambient Temp (°C)

Installation Altitude (m ASL)

MOTOR SELECTION SUMMARY

Motor is correctly sized for the application with adequate safety margins.

STANDARD MOTOR RATING 7.5 kW

Frame: 132M

FULL LOAD CURRENT (FLC) 14.8 A

3φ

STARTING CURRENT SPIKE 88.8 A

Recommended Cable: 2.5 mm² Cu

Min Breaker Rating: 25 A

Shaft Torque: 49.4 N·m

Combined Derating Factor: 100.0%

Electric Motor Selection & Protection Fundamentals

Correct electric motor sizing requires evaluating the driven mechanical load, duty cycle, ambient operating environment, starting method, and electrical line protection per IEC 60034 and NEC standards.

Three-Phase Full Load Current (FLC) Formula

FLC (Amps) = (Power in Watts) / (√3 × Voltage × Power Factor × Efficiency)