DC Motor Speed Control Mod. ASC1-3, Chassis Open. Power: 3HP (2.25 KW) Armature Output: 0 ~ 110VDC, 28 Amps. No Field Output. Input Power: 120VAC, 50/60 Hz. Single Phase Feedback: Armature/Tacho 1 Year Warranty. Dimensions: 7" X 5" X 4.4" Shipping Dimensions: 10" X 8" X 7"