Variable DC speed control, output voltage 90/180 VDC, shunt wound voltage 100/200 VDC, power rating @ lower voltage 1/50 - 1/4 HP, @ higher voltage 1/25 - 1/2 HP, input voltage 120/240 VAC, speed range 25:1, maximum current 3.0 amps, enclosure NEMA 4/12, acceleration fixed @ 5 sec, minimum/maximum speed adjustable, IR compensation adjustable, On/Off switch, fuse protected, length 5.50 in, depth 3.50 in, width 3.81 in.