Cutler Hammer 1600 Amp 480/277V Distribution Section with 400 Amp Ground Fault

Cutler Hammer PRL4 Panelboard This is a leftover distribution section from a 2000 Amp panelboard. The label says 2000A however I believe this is only 1600A rated This is a very custom piece. 400 Amp Main Breaker HKD3400 with KES3400LSG Breaker feeding this section Single bus See Photos Let me know if you have any questions