This power supply contains three voltages: 0-30VDC @ 5A, 0-40VAC @ 5A, and 0-110VAC @ 2.5A. All three supplies are controlled by the voltage adjust knob on the front panel. The unit also contains a volt and amp meter the volt meter is used for both 30VDC and 40VAC output voltages; the amp meter only registers the DC output current. The outputs are fuse protected from overload or shorting. Size: 5 3/8?H x 7 3/4?W x 12?D ; weight 14 lbs.