ECN Forum Forums Photo Discussion Forums Photos for General Discussion Toasty Fuse

For the record, the top photo has been flipped 90 deg. when it was transplanted here. The fuses are horizontal, but that has never made a differance in any piece of equipment I've ever worked on. I may keep these and experiment on the fuse when I get the time. If this failure could be detected early with an ohm meter it might just pay to do a little preventative checking. Let see 71 airhandlers 9 fuses each....639 fuses over 1001 square feet of roof. If you don't factor in the fire alarms, much less trouble to just let'em toast! (just kidding)

One of them heat scannin' units ought to work out pretty well fer stuff like this, heh?

I would do as Radar said.Put an IR gun on it while loaded.And it's a good idea to check all of the units while your at it.We do thermographic pictures of everything over 480 as a bi-yearly PM.It does look and sound like a defective fuse though.Some times the element drops into the silica and still conducts.I've seen 600V fuses pass 120v and open when you pull it.In 12 years we had a 400 ton chiller plant do this three times and had EE's check it every time and never find a problem.

[This message has been edited by frank (edited 01-07-2006).]

Must've been Elvis.

Looks like loose fuse clip to me fellas.
I check fuses for a snug fit when i replace them. If the fuse is loose in the clip I usually remove the fuse and give a little squeeze with needle nose pliers, replace fuse and call it good. Don't forget fuse cost plus labor.