This motor speed controller is suitable for AC220V 50/60H motors. The speed control range is 90-1400r/min 50H and 90-1700r/min 60H. It is easy to operate and even novices can learn and master the operation quickly. The black wire is the main wire of the motor speed controller, the red and white are the auxiliary wires for the capacitors, the 2 blue wires are the feedback wires for the speed control and the green wire is the earth wire. The motor controller uses high quality electronic circuits and integrated components for a long service life. The threaded knob with potentiometer facilitates rotation and stepless speed adjustment. The motor controller features small size, high precision, wide speed range and long life. High control accuracy for microscopic control of the motor speed. Motor speed controllers are suitable for speed control drives on production lines in the packaging, printing, food, electronics, instrumentation, medical equipment and clothing industries. Specifications:Power supply: AC220V50/60h Rated power: 400WEnvironment temperature: - 10 ~ + 50 Relative humidity: