Features: - DC Motor Speed Controller allows controlling Speed of a DC motor using a Pulse-Width-Modulated (PWM) DC voltage with a Duty Cycle - Fully adjustable from 10%-100%. The motor Speed controller can provide a continuous current of 8A to your DC motor or other DC load. - The circuit also includes a 10A fuse, with reverse connection of power supply and control voltage over-voltage protection function. Specifications: - Input supply voltage: 12V-40VDC - The maximum output power: 0.01-400W - The maximum continuous output current :8A; - The overload and short circuit protecting current is 10A - PWM frequency: 13 kHz - Duty Cycle adjustable: 10%-100% - The 10A fuse with reverse connection of power supply and control voltage over-voltage protection function - Item size:60 * 55 * 28mm Package Included: 1 x CCMHCW DC 12V ~40V 400W 10A Adjustable DC Motor Speed Controller PWM Controller Important Notes: - An appropriately rated fuse (rated a little higher than the maximum current you expect to draw) is recommended to ensure safe - The controller is with reverse-polarity protection and the fuse will be damaged if connect the supply voltage with wrong polarity. - Double check all connections before applying power and always turn off the power supply before making any wiring changes. .