IE2, IE3 and IE4 are international efficiency classes for electric motors, defined in the standard IEC 60034-30-1. IE1 is standard efficiency, IE2 high, IE3 premium and IE4 super premium. Each higher class means lower losses for the same power and number of poles.
The classes matter because many markets set a legal minimum. If your motor or pump falls below it, it cannot be placed on that market.
How the classes work
The standard sets minimum efficiency values by rated power, number of poles and frequency. A small motor naturally has lower efficiency than a large one, so an IE3 small motor can still be less efficient than an IE2 large one. Always compare class against class at the same rating.
Efficiency is measured by a test method set out in IEC 60034-2-1. Ask the maker which method it used and to see the test report for your motor rating.
The EU requirement as of October 2026
In the EU, Commission Regulation (EU) 2019/1781 sets ecodesign rules for motors and variable speed drives. As summarised by the IEA 4E Electric Motor Systems Platform, its requirements as of October 2026 are these:
- Three-phase motors from 0.75 kW to 1,000 kW with 2, 4, 6 or 8 poles must meet at least IE3, since 1 July 2021.
- Three-phase motors from 0.12 kW to below 0.75 kW must meet at least IE2, since 1 July 2021.
- Three-phase motors from 75 kW to 200 kW with 2, 4 or 6 poles must meet IE4, since 1 July 2023, with exceptions such as brake motors and explosion-protected motors.
- Single-phase motors of 0.12 kW and above, and Ex eb increased-safety motors, must meet at least IE2, since 1 July 2023.
- Variable speed drives from 0.12 kW to 1,000 kW must meet the IE2 drive loss class.
The regulation has exemptions, and some motors built into products are treated differently. Whether a submersible pump motor falls inside its scope depends on the exact design, so check the regulation text with your notified body or a compliance adviser. Clean-water pumps also have their own ecodesign rule, covered in CE requirements for Indian pumps.
What this means for Indian motors
Many Indian makers offer IE2 and IE3 motors, and some offer IE4 in certain frames. Higher classes need more active material, better laminations and tighter manufacturing, so they cost more. Copper winding helps, as explained in copper vs aluminium winding.
Ask for a test report showing measured efficiency at full load against the class limit. A class printed on the nameplate is a claim, not proof.
Outside the EU, many countries have their own minimum class, and some refer to IEC 60034-30-1 directly. Check the rule for each market you sell into, and date the check, because these limits tighten over time.
Next step
We check that makers can show tested efficiency for your rating and market before you order. Book a free sourcing review.