Meter Mod III. Main Breaker Modules. Main Breaker Three-Phase, Four-Wire 208Y/120 Vac or Three-Phase, Four-Wire 120/240 Vac, Delta Hi-Leg with Arc Reduction Means. An arc reduction means that satisfies the requirement of NEC 2014 Section 240.87. Main ampere rating: 1400 amps. IC rating (max): 100 KAIC. Bottom feed.