For sale is a GE V150PA20C varistor. It is a massive varistor rated for 80J. Provide ample surge protection. Maximum AC Volts 150VAC, Maximum DC Volts 200VDC, Current-Surge 6500A. Rated for whopping 80 joules. Two of these, bolted to a grounded bar and connected to two legs of 220V, provide "whole house surge protection" feature. New Old Stock, never used.
I have many of such varistors. Write me at ichudov@algebra.com if you have any questions.
See http://www.littelfuse.com/data/en/Data_Sheets/PA.pdf