The SPD PDU Power 19″ is intended to protect equipment from power surges and electrical noise while also providing a convenient combination of power outlets suitable for most applications. A unique mounting system enables mounting in a variety of modes to accommodate crowded racks. Even if there is no rack space available, the units can be mounted externally on the front or back of the rack. The units require a single 1RU rack space for installation when mounted horizontally. The unit requires 3RU (132mm) of rack space for vertical mounting. The unit can also be mounted flush to either side of a rack or cabinet.