ZCASE® FHZ Fuse Holders Littelfuse 5 Stud and 7 Stud ZCASE® FHZ Fuse Holders are configurable products designed for primary high-current power distribution. These Littelfuse 400A, 32VDC fuse holders use a power input terminal that is usually paired with a ZCASE shunt for the input. With common bused power, configurable studs (M6, M8, or M10) and appropriate ZCASE fuses, a wide variety of configurations are possible. The dust covers prevent dust from entering the back of the fuse box and the cover protects the fuses from debris.