The APF-4L-50N Active Power Filter is designed to address harmonic issues caused by nonlinear loads in the electrical grid. It can be freely combined with other units to meet the needs of different capacity combinations. 1. Dynamic Compensation; 2. Flexible Regulation; 3. Energy Saving and Environmentally Friendly; 4. Easy Operation; 5. Suitable for Nonlinear Loads; 6. Free Paralleling.