Specifications: (1) Working voltage: DC10VDC50V wide working voltage range (2) Control power: 0.012000W (maximum rated current 40A). Different operating voltages correspond to different control powers as follows: When the working voltage is 12V, 12V*40A = 480W When the working voltage is 24V, 24V*40A = 960W When the working voltage is 36V, 36V*40A = 1440W When the working voltage is 40V, 40V*40A = 1600W When the working voltage is 50V, 50V*40A = 2000W (3) Static current: 0.025A (the static current will not exceed 25mA when the working voltage is DC10V to DC50V) (4) PWM duty cycle: 5%100% (5) PWM frequency: 12kHz (6) Working temperature: -20C to 40C (the ambient temperature range is -20C to +40C). This governor is of industrial grade quality and can work stably in environments below zero. Dimensions of the circuit board: length 90 mm, width 51 mm, height about 30 mm (not including the adjustment part of the potentiometer) The main purpose: 1. Speed regulation for various general-purpose brushed DC motors 2. Motor speed regulation for various vehicles (speed regulation of vehicle cooling fans, vehicle fans, vehicle wiper motors, vehicle air-conditioning fans) 3. Speed regulation of conveyor belts in production lines, pipeline exhaust fans, treadmills, parallel speed regulation of multiple computer fans, and speed regulation of electronic fans 4. Dimming of various DC bulbs and temperature adjustment of various DC heaters