CPS SPD60 Service Type: 120 / 240 single phase, 50 or 60 Hz Max Surge Current: 60,000 Amps Diagnostic Lights: Green LED indicates surge protection active and Red the device has power Response time of Easy installation at the electrical panel or A/C disconnect 5-2-1 Surge Protector, 60000 Amps, 120/240 single phase, 50 or 60 Hz The 5-2-1 Compressor Saver introduces the SPD150 Surge Protection devices that incorporate the latest in protection technology and ease of installation. These devices are designed to protect your equipment by suppressing the harmful energy produced by lightning strikes and other power line transients commonly found in HVAC installations. The voltage surges or spikes can be very damaging to HVAC equipment, shortening the life of the compressor and reducing its efficiency.Protection for:Entire HVAC unit Furnaces Heat pumps Motors Refrigeration systems Electro-mechanical devices