Cooper Bussmann NO 263 Number-263 Non Rejection Pair Cartridge Fuse Reducer

These are stamped from extremely thin copper and they are very difficult to slip on and off the end of fuses without damaging either the reducers, the fuse, or injuring one's self. Also, neither these reducers nor fuses are perfectly cylindrical, so although these probably do make sufficient electrical contact with fuses to be adequate for lower current connections, the fuse holders I tried them with did not very securely hold fuses fitted with these reducers.I ended up throwing these away and using some older fuse reducers I had which had much more thickness and provided a much more solid connection. It is a mystery to me why these received so many positive reviews on Amazon.

I could not find the right amperage in the right size to get my old HVAC to pass inspection for my home sale. But these adapters solved the problem letting me use 2" buss fuses of the correct rating in the 3" slots - and let me sell my house.

I bought these to put some 20 amp fuses in a disconnect box and they fit very tight and very secure and I’m quite happy they are a little pricey but they are extremely specialized. You get what you pay for.

These push on to each end of a 2" cartridge fuse to allow it to fit in the space reserved for a larger diameter 3" cartridge fuse. The fit is tight so some effort is required to push it fully on. There is a tab inside to stop it from over sliding.I installed a higher efficiency AC unit and could not get fuses small enough to meet the recommended fuse size in the old 3" length. These solved the problem without an expensive and unnecessary fuse box replacement.Shipping was expensive, but the overall price was right.

I'm not sure but I don't think you're going to find these on the shelf @ HD or Lowes. I didn't. But with the setup AC box I had, I needed these. In fact, I needed two sets. Cooper B is the the best. I feel better using the smaller recommended fuse size my AC condenser unit listed rather than using a larger amperage fuse for convenience of the breaker box. This is basically a low cost part but some vendors may charge different shipping prices. Look at all the options for purchase!

They split as you fight to get them over the fuses. I use similar products all the time, but these are junk!!!!!

Worked GREAT!! Kept me from having to install a new fuse box, which saved me time and money.

Excellent choice to modify fuse sockets to accept different size fuses