DC speed controls provide adjustable acceleration and deceleration. Here is some additional information about Dart Controls DC Speed Control. Voltage Output: 0 to 90/180VDC, Enclosure: Chassis.FeaturesFor Use With: Material Handling, Laboratory, Food Processing, Pump, Fan/Blower, Conveyor, Machine Tool, DC Motor and Spooling ApplicationsVoltage Output: 0 to 90/180VDCHeight: 4.25"Current/Torque Limit: AdjustableIR Compensation: AdjustableLinear Acceleration: Adjustable 0.5 to 8 sec.Enclosure: ChassisShunt Wound Volts: 100/200VDCLinear Deceleration: Adjustable 0.5 to 8 sec.DC Speed Control: SCRPower On Light: NoHP @ Higher Volts: 1/25 to 1/4Rotation: Single DirectionStandards: cULus Recognized and CE CertifiedMount Type: ChassisWidth: 3.63"AC Input Voltage: 120/240VACOperating Temp.: -10 Degrees to 45 Degrees CFollower Circuit: NoDynamic Braking: NoHP @ Lower Volts: 1/50 to 1/8Depth: 1.31"Item: DC Speed ControlMax. Amps: 1.2Speed Range: 50:1Accepts Tach Feedback: YesExternal Switches: NoneSpeed Regulation: +/-1% with Armature Voltage Feedback, +/-0.5% with Tach FeedbackIncludes: Speed Potentiometer Knob and Dial Plate