2 Pack HOT-DC 12V 24V 48V 5A 2 3 4 Wire PWM Motor Fan Speed Controller Governor Temperature Control Support EC EBM Fan 

Power supply voltage: DC11-55V (circuit operating voltage)Working current: Less than 0.1AFan current: Less than 5A (on-board connector withstand capability, if you need to control higher power, you only need to take the power cord separately)PWM range: 5-100 or 0 (% plus or minus 0.3%)PWM frequency: 20KHz or 2.5KHz (±2%)PWM signal amplitude: 10.5V (no load)Temperature measurement range: -9.9-99.9 CelsiusTemperature measurement error: error within 0-50 Celsius is less than 1.2 Celsius, other range error is less than 2 CelsiusInterface introduction:Power connector (blue screw terminal): The main power input interface supplies power to the control board and the fan.Fan interface (white VH3.96-4P socket): fan output interface, please refer to the picture for line sequence.Temperature probe interface: Connect NTC probe parameter 10K B=3950.Alarm signal port (WORK): Outputs a high level during normal operation and outputs a low level when the fan is abnormal.Relay interface (RELAY): An expansion interface that drives a 9V or 12V relay that can be used to control the fan power line. When the fan control is stopped, the relay is disconnected.Colour:As shownMaterial:PC+MetalPackage Contents:2 x ControllerOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.