MT-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 description: Item Code No.No. of terminalscircuit of applicationapplicable meter form designationMeter class ratingFix hub sizestds packspacking sizeMT-100R-B4 2W/3W,1Phase 1S/2S 100 1/2" 40 74X38X42CMMT-100R-C4 2W/3W,1Phase 1S/2S 100 3/4" 40 ...