T120-DG is NOT rated for 120VAC mains power. 120VAC has a peak voltage of 170V, which exceeds this T120-DG’s 144V MCOV and will damage the device - The Eclips DG series of hybrid TVSS devices are designed to provide ultra low line capacitance with superior protection. Gas Discharge Tube (GDT) and Silicone Avalanche Diodes (SAD) provide protection to sensitive electronic equipment by clamping over-voltage energy pulses and discharging them to ground. This unique design along with the hybrid electronics will protect critical system components. The first Surge Protection Device (SPD) that is truly scalable and provides real solutions. The packaging allows for mixed technology to be configured together that maintains system integrity managing ground planes and structured wiring for service and maintenance. The design features slide together modules and provides panel screw mount, snap track or Din rail mounting options. Coupled with pluggable screw terminals for easy replacement and servicing.Transient Voltage Surge Suppressors (TVSS) must have a stable ground. Eclips is the first to design a SPD that has a managed ground bus that features a single point of ground to ensure ideal conditions. This allows you to maintain system integrity, inspection and proper maintenance against electrical transients introduced to sensitive electronics. Providing protection against nuisance alarm and preventable system failure and ensure that your SPD utilizes proper ground path.How it works: In most instances the SAD does the majority of the work the SAD clamps closer the "working" voltage to provide the highest level of protection. An SPD clamping devices uses a non-linear element that conducts or short to ground when exposed to over-voltage. Such a device absorbs a large portion of the impulse energy, converting it to heat. When a transient voltage surge occurs SAD diode clamps the voltage at safe level and divert the over voltage to ground. The SAD can conduct over-voltage pulses over and over without degrading of component. The Gas Discharge Tube (GDT) is a fully re-settable device that will protect against high voltage surges (lighting). Both GDT and SAD components return to its high impedance state when the voltage returns to normal levels.