... 100R series round meter base 1. 100Amps,120~240VAC, 2. Single phase,4 terminal,2 or 3 wire,Fix hub ... size:1/2",3/4",1"1-1/4 MT-100R Series Round meter box ... Item Code No.No. of terminalscircuit of applicationapplicable meter form designationMeter class ratingFix hub sizestds packspacking sizeMT-100R ... AC,Single phase,4 terminals,2 or 3 wire Copper Jaw,Copper or aluminum connector•The Die- ...