HFD3225 time current curves

Where do you source Time Current Curves or Trip Curves for Cutler-Hammer circuit breakers?When it comes to field testing circuit breakers you need to have the specific Time Current Trip Curves in order to perform long-time primary injection testing on molded case circuit breakers. Our company Switch Gear Testing, has been buying all its thermal magnetic molded case circuit breakers from Westport Apparatus Electrical Supply in Orange, California.Why, I’ll tell you why, because they are always professional and they support us with all factory documentation as required for a certified test.Two months ago a water treatment plant was experiencing some nuisance tripping with a Cutler-Hammer HFD3225 Series C breaker.Once the customer notified us of the specific breaker in question all I had to do was call Frank at Westport Apparatus and had him email  us the test time curves No.SC-4438-88A #TC01200002E. With the right information we were able to specifically determine that the breaker was tripping too soon and outside the normal operating trip range.Below I’ve included a copy of this Time Current Curves graph. The room or ambient temperature is critical, because this can greatly affect your result.Also providing factory time curve docs really demonstrates to customers the level of professionalism they want.

Another huge factor for using Westport Apparatus is eliminating stock of  millions of dollars of expensive circuit breakers which  the normal full-line distributors just can't afford to inventory. In fact Frank the owner tells me that his primary business is to supply the local distributors across the country. Now that I didn’t know.I guess that’s why I get the lowest price, because I’m buying direct and not through a middle-man. Not even the authorized Cutler-Hammer distributors can afford to stock all the Series C line of Breakers. Westport Apparatus stock all amps from 15 ampere up to the RD 2500 ampere breakers. My local supplier is good for pipe, wire lighting and all that stuff which is not carried by Westport Apparatus. They mainly stock the circuit breakers, panel boards to mount them in and the hardware connector kits. Understanding how Cutler-Hammer evolved the KPRL panel boards is another science. Getting the right parts can only be done by experts and that’s Westport Apparatus.
If you’re busy like me, go to the best and save time and get the most competitive prices. I assure you.
Mike Acebo, SST
Orange County, CA