... 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: ... 100R-C4 2W/3W,1Phase 1S/2S 100 3/4" 40 74X38X42CMMT-100R-D4 2W/3W,1Phase 1S/2S ... 1S/2S 100 1 1/4" 40 74X38X42CM•100Amps,120/240V AC,Single phase,4 terminals,2 or 3 ... sealing ringFix hub size:1/2,3/4,1,1-1/4 for option• 100A Round Meter Base