Siemens SpeedFax™ P1A30MC400AT Type P1 Panelboard Interior, 120/240 VAC, 400 A

Type P1 unassembled panelboards are completely convertible from main lug to main breaker and vice-versa. Additionally feed-thru lugs or a subfeed circuit breaker up to 400 amperes can be added without increasing the box height.