Search results for query: *

I am in desperate need of an instruction manual for a Westinghouse type DHP 3000A circuit breaker. We have burnt two trip coils because the mechanism is hanging up and need a drawing(parts layout) of how the trip mechanism works. Oh yeah, we found a broken bolt under the breaker when we racked...

We have never found the root cause - only speculation. We have eventually replaced the overloads (5 ea.). We went with the AC-PRO's on the last one(along with 4 other overloads on different manuf. breakers). Zog Zog was correct. They are like a breath of fresh air. Easy to install and the test...

Thank you for all the replies. I have come to love this forum. I'm glad I found it.

I have been tasked by the upppers to come up with retro-fit solid state breaker overloads. These will become the brand that we will always use in the future for replacement of overloads. We have approx. 200 breakers with pre-1980's overloads from many different manufacturers. We have had some...

ZogZog - you are a lifesaver and I am very appreciative. I had the manual, but was missing the last 5 pages, which had the info on restoring lost calibration. Just let me know if there is anything I can help you with in the future.

Is there anyone out there who would have an instruction manual on Allis-Chalmers Static Trip II overloads in PDF format? I have looked on the internet everywhere and cannot find one.

Update! Cutler Hammer has assumed that the overloads are damaged due to moisture and it seems as though the only breakers we are having issues with are those that are installed in Kinney switchgear cabinets. We are in the middle of performing on inventory as to how many breakers are installed in...

You're right. Secondary injection is the only test that has been done. I just assumed that with the type of trips we were getting with very little load was an overload problem. But, you know what they say about ASS-U-ME.

Yeah, I already knew about the percentage of current. That's why I mentioned it. And also, the batteries are good. The batteries do not power the trip unit. It's only function is to maintain the LED indication of fault. That was my first assumption when there was no indication of fault.

As far as the moisture issue goes. CH claims it may be caused by condensation and that the heaters are installed differently than the way CH would do it. So, in addition to exhaust fans, we have installed a 16,000 BTU A/C unit in the switchgear as well a a de-humidifier. This has been an ongoing...

Screwy Results: When performing secondary injection tests by qualified technicians who have tested hundreds of these overloads for the past 8 years (they are on a two year cycle), they could not even arrive at the correct test amperage before the breaker would trip with no indication of why.This...

No zone interlocks. The default setting is the most probable so far. Since we are at a NASA facility, the SPE has indicated to C-H that we may blacklist these breakers and overloads from the center. C-H has now indicated that it is most likely the Kinney switchgear enclosures (source of the...

We did perform secondary injection testing and got screwy results. Replaced with new unit and worked for some time. The problem is, we have approx. 200 ea. of these type of breakers and it seems as though the problem is spreading. We currently are having problems with 3 total. The main issue is...

Has anyone had any issues with Cutler Hammer DSII breakers with RMS overloads tripping for no apparent reason? We have had numerous trips on these breakers at very low loads with no indication as to why they are tripping. Cutler Hammer has suggested that it is a humidity issue.