What are IE efficiency classes?

IE classes (IE1–IE5) are international efficiency classification levels for electric motors defined by IEC 60034-30-1. IE1 is Standard Efficiency, IE2 is High, IE3 is Premium, IE4 is Super Premium, and IE5 is Ultra Premium.

How much energy can upgrading from IE2 to IE4 save?

For a typical 11 kW, 4-pole motor running 6000 hours/year, upgrading from IE2 (89.8%) to IE4 (93.3%) saves approximately 2,300 kWh/year. At €0.15/kWh, that's about €345/year.

What is the minimum efficiency requirement in the EU?

Since July 2023, the EU Ecodesign regulation requires IE4 for motors 75–200 kW and IE3 for motors 0.75–75 kW (2/4/6 pole). Single-phase motors 0.12 kW and above must meet IE2.

Does motor speed affect efficiency?

Yes, 2-pole (3000 RPM) motors generally have slightly lower efficiency than 4-pole (1500 RPM) motors of the same power. 6-pole and 8-pole motors have progressively lower efficiencies. IEC 60034-30-1 specifies different limits by pole count.

What is a typical payback period for a motor upgrade?

Payback periods for motor efficiency upgrades typically range from 1–4 years depending on motor size, running hours, and electricity cost. Motors running 6000+ hours/year with high electricity costs have the shortest payback.

Free Engineering Tool

Motor Efficiency Calculator

Compare IE1–IE5 motor efficiency classes per IEC 60034-30-1. Calculate annual energy cost and savings from upgrading to a higher efficiency class.

IEC 60034-30-1IE1 – IE5Energy Savings

Motor Power (kW)

Poles

Current IE Class

Target IE Class

Running Hours (/year)

Electricity Cost (€/kWh)

Quick presets

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Annual Energy Savings

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Current Efficiency

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Target Efficiency

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Current Annual Energy

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Target Annual Energy

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Current Annual Cost

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Target Annual Cost

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Annual Cost Savings

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Annual Energy Cost by IE Class

Energy Consumption Formula

IE Class Minimum Efficiencies (4-pole, 50 Hz)

Power (kW)	IE1 (%)	IE2 (%)	IE3 (%)	IE4 (%)	IE5 (%)
0.75	72.1	77.4	80.7	83.5	85.7
1.5	77.2	81.3	84.2	86.7	88.6
3	81.5	84.6	87.1	89.3	90.9
7.5	85.7	88.1	90.4	92.0	93.4
11	87.0	89.4	91.4	93.0	94.0
22	89.5	91.3	93.0	94.3	95.0
55	91.8	93.2	94.6	95.7	96.1
110	93.0	94.3	95.4	96.4	96.8
200	94.0	95.0	96.0	96.8	97.2

Source: IEC 60034-30-1:2014. Values shown are for 4-pole, 50 Hz motors. 2-pole and 6-pole motors have different efficiency limits.

Motor Efficiency Calculator | IE1–IE5 Savings | IEC 60034-30-1

Published by Nikolai Shelkovenko on February 15, 2026 February 15, 2026

Results

Energy Consumption Formula

IE Class Minimum Efficiencies (4-pole, 50 Hz)