COOPER BUSSMANN BPHA24D24LV Low Voltage Repl Module, 24V Hybrid SPD. More details: Surge Protecive Device, Type 4, Location Type Type 2, Nominal Discharge Current 1kA, Max. Surge Current Per Phase 1kA, Max. Surge Current Per Mode 2kA, Max. Continuing Operating Voltage 30Vac/30Vdc, Length 1.77, Width 0.71, Depth 2.13, Standards IEC 61643-1, UL 1449 3rd Edition