3 phase 20 KVA, Universal power supply made by International Power Machines. Part # 20KVA BP+20-20KVA. The units work on 220 Volts with back batteries for power failure. These two units were used by a major cable company that had to up grade to a larger unit. The 2 units are in good working condition. The units are approximately 10 years old. BL Part# I0021