EATON SP1 surge protector has a compact 50KA per phase footprint, with half-inch molded nipple and optional din rail mounting kit that make this surge protection device easy to install on point of use locations, control panels, load centers and small distribution panel (up to 200amp). With an industry best 20KA nominal discharge rating and low VPR ratings, EATON SP1 surge protective device is a UL 1449 4th edition surge device that provides reliable, cost-effective surge protection.