Three phase from 2 kVA thru to 150 kVA. Single phase. UL 1604 - File No. E258346 (class 1, division 2, groups A, B, C and D hazardous locations). ABS type approval - Certificate No. 04-MO523208-X (Marine duty service and offshore applications). Standard on all three phase units and single phase units over 0.50 kVA. Provides quality power and superior protection. All units are encapsulated with electrical grade silica sand and resin compounds which completely enclose the core and coil to seal out moisture, airborne contaminants and eliminates corrosion and deterioration.