The Maximum continuous AC Power rating: 7.5kVA
Primary Voltage: 460VAC
Secondary Voltage: 230 L-L;133 L-N
Can be tapped to provide either: 105.0%, 100.0%, or 95.0% of primary nominal voltage.
Winding Structure: Delta/G-Wye
Percent Impedance at 170 C (normal operating temperature): 3.3%
Insulation class: 220(220 C will be the maximum winding temperature when in service. Hotter than that and something is wrong.)
Cooling Method: AA(Ambient Air)
Most likely usage: Isolation for an electric motor(hence the strange primary voltage and delta primary winding.)