stolen from stpetecooling:
"
The part number is 14D181K, where the 14 refers to the physical size, and the 181 refers to the voltage. You can find an alldata sheet on it. As I recall it is 115 volts, and 50 joules, peak of 4500 amps (I'm not positive about the final numbers). It is a basic, conservatively rated protector for North American electronics. "