Type: speed controller Operating Voltage: DC 10V~DC 50V Control Power: 0.01-3000W (maximum rated current of 60A) different operating voltages corresponding to different control power as follows: Operating Voltage 12V, 12V x 100A = 1200W Operating Voltage 24V, 24V x 100A = 2400W Operating Voltage 30V, 30V x 100A = 3000W Quiescent Current: 0.04A (operating voltage DC10V to DC30V quiescent current will not exceed 40ma) PWM Duty Cycle: 0% -100% PWM Frequency: 15khz Operating temperature: -20Celsius~40Celsius (ambient temperature of minus 20 degrees to 40 degrees above zero) The governor of the industrial-grade quality, can be less than zero stable work environment, general commercial-grade quality of governor in It is not stable work in sub-zero temperatures. Circuit board Dimensions: 145x80x40mm / 5.7inch x 3.1inch x 1.6inch (not including adjustment portion potentiometer) Application: Various types of general-purpose DC brush motor speed Various types of vehicles with motor speed (automotive cooling fan speed, auto fan speed, auto wiper motor speed, automotive air-conditioning fan speed) The production line belt speed, pipeline exhaust fan speed, treadmill speed, multiple computers in parallel fan speed control, electronic fan speed control. Various types of DC lamp dimmer, various types of DC heater thermostat. Colour: silver Material: Metal Package Contents: 4 x motor speed controller