FX0385 10A Inline Fuse Holder for 5 x 20mm Automotive Fuse, 250V. Bulgin FX0 series of In-line fuse holders designed for housing 5×20 mm, 6.3×25 and 6.3×32 mm cartridge fuses. The fully enclosed holders are robust and reliable, and with their two-part construction are simple to install. In-line fuse holders make it easier to access or change fuses in an electrical circuit as and when required.