For large production lines, crushers and heavily loaded conveyors, high kW electric motors become far more flexible when offered in both IE3 and IE4 efficiency classes. As a supplier, DRG Motor supplies plants needing more than 30 kW with a broad range of frames and pole numbers in either class.

Where Does the IE3 and IE4 Difference Show?

Under IEC 60034-30-1, IE3 defines the Premium and IE4 the Super Premium efficiency class. In high kW motors, the IE4 winding and magnetic design cut copper and iron losses further at the same load point. In plants running 16 hours a day or more, the extra IE4 efficiency produces a visible difference on the energy bill, while IE3 remains a balanced choice for shorter shifts.

Power and Speed Options

The DRG high kW series spans 30 kW to 355 kW. Speed depends on the application: 2-pole 3000 rpm for pumps and compressors, 4-pole 1500 rpm for general drive duty, and 6-pole 1000 rpm for crushers and mills that demand high torque. The whole range is built around a 400 V / 50 Hz supply and S1 continuous duty.

Frame and Durability

High-power models use a cast iron frame that damps vibration and ensures long service life under heavy industrial conditions. IP55 protection suits dusty and humid environments, while Class F insulation keeps the motor stable at elevated temperatures. Foot-mounted B3, flange-mounted B5 and combined B35 frames are available on request.

Let Us Define the Right Class Together

Whether IE3 or IE4 fits best depends on running hours, load profile and payback expectations. DRG Motor engineers calculate the consumption for your high kW project and weigh the cost-efficiency balance between the two classes with you, then recommend the motor that suits your application.