Eaton IE3 premium efficiency motors are characterized not only by significantly improved efficiency, but also by lower internal resistance. As a result, their in rush currents can reach magnitudes of 14 x IN.
This means that contactors that are not suitable for use with IE3 motors will see their contact mechanism wear out more quickly as a result of higher inrush currents, eventually leading to the contacts sticking sooner than normal. Process downtimes are a definite possibility in applications with frequent switching operations, and configurations using short-circuit protective devices, such as fuses and motor-protective circuit-breakers, that are not designed for IE3 motors are likely to be rendered ineffective due to nuisance blowing and tripping.
Eaton motor starters have been specifically tested for operation with IE3 motors. The results? The higher inrush currents produced by these motors pose no problem for our motor starters, meaning that there is absolutely no risk of having to deal with faster wear and increased maintenance. You can simply continue to use your Eaton motor starters as usual and switch and protect your IE3 motors today and tomorrow.