Frequently Asked Questions


Which Reactor Type is Right For You?

We often get asked by customers if we would recommend using an RL-Reactor or an RLW-Reactor. There are a number of factors that need to be considered when making this decision. The information on this page is designed to help you make that decision. However, if you’d like to speak to one of our application engineers you can call (262) 946-2818 or email

General Differences

In general, the RL Reactors are more robust and perform better with regard to watts loss and overload capability.  Both can be used on Line Side and Load Side, however the RLW needs to be derated when used on the load side.  Also, RL Reactors are available in open style, NEMA 1/2 and NEMA 3R cabinets.  RLW reactors are not available in NEMA 3R as a standard offering, but can be purchased in open style and in NEMA 1/2 cabinets.


Technical Specification Differences


RL ReactorsRLW Reactors
Continuous Service FactorReactors rated 1 to 750 amps: 150% of rating; Reactors rated above 750 amps: 125% of rating100%
Overload Rating200% of rated for 30 minutes; 300% of rated for 1 minute150% of RMS rating for 1 minute; 200% of RMS rating for 10 seconds
Current Range (additional ratings may be available)1A – 1,500A0.5A – 750A
Temperature Rise135 Degrees Celsius140 Degrees Celsius
Inductance Curve100% at 100% Current; 100% at 150% Current; 50% at 350% Current; 100% at 100% Current80% at 150% Current; 50% at 200% Current
Impedance Levels1.5%, 3% & 5%
Input Voltage Range208V – 690V
Ambient Temperature-40 to 50 Degrees Celsius
Altitude Maximum Without Derating1,000 meters
Fundamental Frequency50/60 Hz