Features: Input/Output Voltage: The motor speed controller has an input voltage of 220VAC and an output voltage of 180VDC. Working Principle: This electronic speed controller is a direct-start type, consisting of a motor, a miniature reducer, a speed sensor, and an electromechanical integrated component. Forward/Reverse Connection: By connecting M+ or M-, the motor speed controller can achieve forward and reverse rotation. Excellent Mechanical Performance: This motor speed controller has excellent mechanical performance and a wide speed range. Easy Installation: This motor speed controller uses panel screws for easy installation. Usage Instructions: 1. Before use, please turn the external speed control knob to 0 to avoid instantaneous high current damage to the speed controller. 2. The rear terminals AC represent the input voltage, M+/M- represent the motor output power, and P1 and P2 are emergency stop terminals. A short circuit between P1 and P2 will stop the motor. 3. This product uses a built-in fuse for overcurrent or short-circuit protection. After the fuse blows, a replacement fuse of the same specification should be used. The panel switch only controls the motor's start or stop, not the power supply. Specifications: Product Type: Motor Speed ​​Controller Material: ABS Input: 220VAC Output: 180VDC Dimensions: Approx. 100x60x114mm / 3.9x2.4x4.5in Hole Size: Approx. 81x53mm / 3.20x2.1in Mounting Method: Panel screw mounting Power: 250/400/500 Watts Package Includes: 1 motor speed controller Note: Please allow 1-2cm error due to manual measurement. Please ensure you do not mind before placing an order. Due to differences in monitors, the image may not reflect the actual color of the product.