Surge Protective Device, Voltage Rating: 120 to 240V, Amperage Rating: 10000A (Nominal Discharge), 20000A (Short Circuit Current), Phase: 1, Frequency: 50/60 Hz, Length: 4.5 inch, Width: 4.25 inch, Depth: 2 inch, Applications: For Air Handlers, Furnace, Central Air Conditioning, Mini-splits, Hydronic Heating, Heat Pumps, Standards/Approvals: ANSI/UL 1449, cULus Listed