The OVRH series of SPDs are intended for non-DIN RAIL SPD applications. The OVRH series can be mounted internal or external to the equipment being protected. These new products offer a wider range of surge current capabilities, with surge ratings from 20kA up to 400kA per phase. Surge ratings are based on the UL 8x20 micro-second wave shape, and cover all facility AC SPD needs to include Main distribution, Sub Distribution and point of use applications.