The SYM400 is a modular uninterruptible power supply for data centers and mission-critical facilities, rated at 400kVA . It is built from four 100 kVA hot-swappable power modules , so a module can be added or replaced without taking the load off the system. Three-level inverter and IGBT rectification keep efficiency at ≥96% with THDi below 3%, while the wide 138~485 VAC input window tolerates unstable grids. Output is 380/400/415 VAC in a 3 phase N PE system, supervised by an