1. What is IE4?

  • IE: Abbreviation for International Efficiency classification.

  • Efficiency classes range from IE1 → IE4.

  • IE4 = “Super Premium Efficiency”, meaning motors with extremely high efficiency.

  • Defined by the IEC 60034-30 standard.

2. Features of IE4 Motors

  • High energy savings → Consume 3–5% less electricity than IE3 and 8–10% less than IE2.

  • Reduced losses → Improved stator and rotor design, lower magnetic losses.

  • Lower heating → Longer lifespan, extended bearing and winding life.

  • Quiet and vibration-free operation → Preferred in sensitive applications.

  • Compatible with frequency inverters (VFDs) → Provides very high savings in variable-speed operations.

3. Application Areas

IE4 motors are particularly preferred in continuous operations and applications with high energy consumption, such as:

  • Pump and fan systems

  • Compressors

  • Conveyors

  • Cooling units

  • Heavy industry facilities (cement, iron-steel, petrochemical)

  • Mining machinery

4. Advantage – Cost Balance

  • Initial investment cost is 20–30% higher compared to IE3 motors.

  • However, thanks to energy savings, they usually pay for themselves within 1–2 years.

  • Especially in motors 75 kW and above, savings become much more significant.