10-55V 60A 5000W Reversible DC Motor Speed Controller PWM Control Soft Start Features: Well design case can protect the controller board from damage as well as dissipate heat. Designed with a digit display that shows the rate in percent of actual speed to maximum speed. This motor speed controller can be installed to accomplish reversing the motor's direction. With high power allows setting rotation direction. Fine workmanship and good performance. Stable and reliable. Long service life. Specification: Technical indicators: Input voltage: DC10-55V Output voltage: linear under load Maximum current: 60A Continuous current: 40A Speed regulation type: adjust current Speed control mode: potentiometer (linear) Wiring type: fence terminal block Motherboard size: 100MM*76MM*28MM Shell size: 110*78*38MM Speed Range: 0% to 100% Control Frequency: 15KHz Knob specification: 100K (with switch) Forward rotation reverse: support Suitable for: Brushed DC motor   Package included: 1 x Motor Speed Controller NOTE： * Please allow 0-1cm errors due to manual measurement. * Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. * The digital display is the motor full speed percentage 0-100 non-motor actual speed. * The input voltage must be positive or negative. * The input voltage should be equal to the rated voltage of the motor within 10-55V DC. * Make sure that the positive and negative connections are correct before powering on. Do not touch the heat sink with the wiring. If it touches, it may burn the circuit board. This is not a power module. It must be connected to the motor to adjust the speed. There is no change in the output of the multimeter without the motor, and it cannot be connected to the AC power.