Features: Equipped with speed control knob, the motor speed can be adjusted for easy use. The operation panel is clear, and the pointers can accurately point to the speed. When the load is a fan or pump, the energy-saving effect is significant. Feature IP5X dustproof rating and can be used for panel embedded or wall mounted, with bottom entry. Used for speed control of electromagnetic asynchronous motors (slip motors), achieving stepless adjustment of constant torque. Specifications: Material: Plastic+Metal Model Name: JD1A-40 Motor Speed Controller Input Speed: 1rpm Output Speed Ranges: 1 Exciting Voltage: DC90V Field Current: 5A Mounting Hole Size: Approx. 192x132mm/7.6x5.2inch Product Size: Approx. 210x150mm/8.3x5.9inch Speed Adjustable: 132-1320rpm Control Motor Power: 15-40kW Input Voltage: AC220V Package Includes: 1 Piece Motor Speed Controller note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.