Bussman Fuse
Why does my central A/C unit keep blowing fuses?
I have a 15 year old central A/C unit. It is 240 volts, of course, and has 2 30-amp fuses outside by the condenser. When I bought the house last spring, I had to replace the fuses before the system would work (makes sense because the house was vacant for over a year, and the fuses were outside). But then during the summer I had to replace another 4-5 fuses.
I turned on the A/C this weekend, and had to replace both fuses (Again, they were outside for the winter), but the system has blow yet another fuse on top of that.
I’m using the proper amp fuses. And they are time delayed fuses (Bussman 30-R).
What’s going on?
A 30amp Class R fuse carries a short circuit interrupting rating of 200,000 amps. Your fuse is definitely rated for inrush current that occurs when your a/c starts up. Never go over your rated fuse size for the a/c unit like suggested in another comment.
Check the nameplate on your condenser to find out the proper amperage. Make sure it says maximum circuit ampacity=30a.
If it does, you have a fault current (short circuit) somewhere in the wiring. Because your fuse is rated to handle the inrush current, but not a short circuit, your fuse links fracture.
I would suggest you call an HVAC guy to come look at your condenser. He can diagnose an electrical problem and if it happens to be a capacitor, he has a stock of them on his truck. Whereas an electrician does not. So it beats having to pay two service guys.
Foxx Guitar Synth w/custom Vactrol.
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