The IronHorse GSD1 series dc drives are high-performance pulse-width-modulated controllers for 12- to 48-V equipment. The drives are available in 10-A (⅛- to ½-hp motor rating) and 20-A (¼- to 1-hp motor rating) versions. New models include 48-V powered units. Features include adjustable maximum speed, minimum speed, current limit, I.R. compensation and acceleration. The adjustable current limit feature protects the control, battery and motor from sustained overloads. The drives are available in open-frame and NEMA 4X enclosed styles and come standard with a speed pot, knob and dial plate. Options include a replacement speed potentiometer kit and digital speed potentiometer.