The EMX-AC-1191 is a type of AC motor speed controller manufactured by Emax. It is designed to control the speed of AC motors up to 2 hp (1.5 kW). The device features overload protection with a 125% current limiting feature, reverse phase protection, and a thermal overload to prevent overheating. It also has a power-to-ground indicator light and a green status display light to show when the device is operating properly. The EMX-AC-1191 is suitable for all types of motor control applications, and is especially useful for controlling the speed of centrifugal pumps, fans, and other devices.