Universal FMX Female MAXI Fuses (FMX-20) by Bussmann®. Amperage Rating: 20A. Trad’l pack. Standard. 1 Fuse per pack, 10 packs per shelf carton. Developed to meet the demand for smaller components, the FMX and low-profile FMX female MAXI fuses offer high amp protection in compact packages. The new FMM micro Maxi fuse meets the latest demand for smaller, high current circuit protection products being found on new model vehicles.