Current Limit-R circuit breakers are designed to protect standard Westinghouse circuit breakers with interrupting ratings as low as 10 kA rms symmetrical on systems capable of delivering fault currents as high as 200kA rms symmetrical. In such a system, the Current Limit-R main breaker and standard Westinghouse branch breaker closest to the fault operate together to limit the amount of let-through fault current. These circuit breakers utilize the Westinghouse patented slot motor concept to provide higher interrupting capacities without using fuses. Current Limit-R circuit breakers are UL listed, meet the NEC definition for a current limiting device, and are the same size as the comparable Tri-Pac circuit breakers. Tri-Pac thermal magnetic circuit breakers provide higher interrupting capacities by utilizing integral current limiting fuses. These circuit breakers can be used in commercial and industrial distribution systems where fault current may reach as high as 200 kA rms symmetrical. Compact Tri-Pac circuit breakers are rated from 15 to 1600 amperes and can be applied as main breakers...and as protective breakers for feeder and branch circuits and other connected apparatus.

For many years Eaton Corp and Westinghouse Electric Co manufactured competitive molded-case circuit breakers under their respective Cutler Hammer and Westinghouse circuit breaker brand names. However, in the 1990s the Cleveland-based Eaton Corp bought the Pittsburgh-based Westinghouse electrical distribution business and merged it with its Cutler Hammer division. Any former Westinghouse circuit breakers or Cutler Hammer breakers that are still in production are now sold under the Cutler Hammer brand name only. However, as a well established brand name, Westinghouse is still very active. When someone needs to replace installed Westinghouse circuit breakers, there will, hopefully, be new Cutler Hammer breakers to replace them (with either the same Part# or a superceding Part#). But if the installed Westinghouse breakers have been obsoleted and if there are no current-series Cutler Hammer breakers to replace them, the customer may have to consider buying quality used Westinghouse breakers instead of current-series Cutler Hammer breakers.