Aluminum frame with stacking pocket. 3 - courtesy 201 Edisons. Digital 3 phase multi-meter. Main breaker with public lock-out door (adj. 400-160A). 100% rated hydraulic magnetic breakers for continuous use. 5 wire (double neutral) 400A CAMS per leg.Dead - front doors available for transport. standard compact 24" L x 24" W truck / trailer footprint. Easy to service - completely removable front and back - panels.