The EMX-AC-1142 is part of the EMAX AC line of DC motor controllers from the manufacturer EMAX. This specific model is a 40A brushless DC motor controller for industrial applications. It features fan-cooled overload protection, over-temperature protection, under-voltage protection and reverse polarity protection. It is compatible with PWM signals for speed control, and is suitable for 6V-36V input voltage range and 0-1000Hz digital signal control. The EMX-AC-1142 also offers adjustable motor speed and current levels, as well as an adjustable brake or coast control setting.