Lightning strikes create surge currents which generate overvoltages in the power distribution and data transmission networks. The ABB OVR surge protective devices (Transient Voltage Surge Suppressor) divert the surge current harmlessly to the ground and limit overvoltage to acceptable values. The OVR range offers the ability to dissipate very high energy up to 100KA per pole (400KA in total). Available for network voltages up to 660V VAC. The OVR range is a UL 1449 recognized , CSA Certified and has IEC & VDE approval ABB TVSS products have an intermediate end of life indicator that provides a 3-step mechanical visual indication. The benefits offered by our OVR range makes it one of the best TVSS devices worldwide.