Integrated System/Rear Wire 250Amp Max, 48V Negative Polarity Output Voltage, 23” / 6RU / Mid Mout, Dual AC Input per Rectifier Shelf (LL AC Cord), Qty 5 Rectifier positions, Qty 20 Distribution Circuit Breaker Positions (CBB style) 1/4″-20 stud 5/8” center, Load Bulk Landings: Qty 1 3/8″ Nuts on 1″ Center, Qty 2 1/4″ Nuts on 5/8″ Center, BC Controller Card Not Included