Ditek HW Surge protective device has a current rating of 15 Amps and voltage rating of 120 Volts. These are engineered and manufactured to the exacting standards of the life safety industry. It features parallel wiring configuration for maximum performance and protection. Diagnostic indicator confirms ground presence, unit function and power on status. It measures 2.930 Inch x 2.830 Inch x 1.680 Inch. Also known as -DTK-120HW Surge Suppressor-Ditek DTK120HW Surge Protective Device 19500 Amp 120/240 Volt AC 1 Phase-DITEK DTK-120HW SURGE PROTECTOR AC HARDWIRE