MT-100R series round meter base 1. 100Amps,120~240VAC, 2. Single phase,4 terminal, ... :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 ... ,3/4,1,1-1/4 for option• 100A Round Meter Base