IE Efficiency Classes for Motors

Posted by Saftronics Admin on

The IE (international efficiency) efficiency classes:

  1. IE1 = Standard Efficiency
  2. IE2 = High Efficiency
  3. IE3 = Premium Efficiency

Less power consumption brings costs down

Change-over to energy-efficient motors pays off because they reduce energy consumption substantially and thus cut operating costs. Whatever requirement you need to meet, we have the right energy-efficient motor for you as part of our portfolio.

IE3 motors from Siemens: much more than just thrifty

The main objective of the IE3 Standard, is to achieve a lasting reduction in energy consumption of electric motors that are operated direct on line and ultimately to make a contribution to the demanding European climate targets in this way. For the developers at Siemens, however, that was not enough: they provided the motors with some additional virtues in the process, alongside the energy efficiency that you can take for granted.

IE3 motors have a different behavior

The energy savings of IE3 motors are mainly based on lower nominal currents. However, starting currents are higher for technical reasons, especially the so-called inrush current of IE3 motors is noticeably higher in direct comparison with IE2 models. But each motor has a different behavior, and the data sheets of the motors do not provide any information on inrush currents. That’s why we performed comprehensive analyses and looked into the behavior of a vast number of motors from various manufacturers. The result: A number of factors need to be considered before switching to IE3.

SIRIUS Industrial Controls for IE3 motors: optimized for higher starting currents

As IE3 motors are characterized by significantly higher inrush currents compared with IE2 models, current monitoring in Industrial Controls needs to be adapted to avoid spurious tripping. In addition, the switching capacity and the current carrying capacity of the Industrial Controls has to be increased. That’s why the latest generation of SIRIUS Industrial Controls has been optimized accordingly on the basis of extensive analyses of the starting characteristics of IE3 motors. With SIRIUS Industrial Controls, you can continue to depend on the usual reliability of your motor load feeders when you change over to IE3 motors


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