Feature: 1. Automatic Voltage Stabilization: Dynamic stabilization, static stabilization, and unregulated stabilization can be selected as needed 2. Low Frequency and Large Torsion: The starting torsion hits twice the rated torsion and constant torsion output within 50HZ 3. Energy Saving: Soft start and stop, energy and power saving, bring motor protection, stepless speed regulation, and low noise operation 4. Protection Functions: Provide overload, overheat, overvoltage, overcurrent, undervoltage, phase loss, grounding, short circuit, and stall protection, flame retardant, moisture proof, anti corrosion and salt spray proof 5. Wide Range of Applications: Suitable for construction sites, factories, water plants, central air conditioning water systems, machine tools, automation equipment, etc. Specification: Item Type: Variable Frequency Drive Shell Material: ABS plastic Power Phase Number: 3 Phase Product Size(LxWxH): Approx. 24.5 x 15 x 18.5cm / 9.6 x 5.9 x 7.3in Application Equipment: Motors, mixers, ball mills, water pumps, cranes, conveyors, air compressors, fans, CNC machine tools, etc. Model Power(KW) Input voltage（V） Output voltage（V） Frequency modulation range（Hz） AT900-55000X 5.5 380±15% 0-380 0-400 AT900-75000X 7.5 380±15% 0-380 0-400 . Package List: 1 x Variable Frequency Drive1 x User Manual Note: Please read the user manual carefully before use, the input voltage is three phase 380VAC, please do not overload operation.