An electrical apparatus has an elongated housing with fuses located therein. Windows are provided in the housing to close apertures in registration with fuse locations to allow access to fuses by removing the window. Fuses may be carried on a circuit card removably engageable with a terminal block secured to a wall within the housing. A fuse compartment cover is removably secured to the housing. The window comprises a fuse condition indicator to allow determination of the condition of the fuse (i.e. blown or not blown) without having to open the window. Additionally, powered indicators such as LEDs visible through the windows may indicate the state of fuses. The housing may comprise a power distribution unit and may be rack mounted or mounted to a wall of a rack assembly. The windows are located on the housing to be removable free of engagement with the assembly. In various embodiments, the windows may be included in a different one of the walls so that the windows will be unobstructed when the housing is in one of a number of orientations. The fuse compartment may be opened without removing the unit from the rack.