The NDQ7H series (63A to 5000A) automatic transfer switchgear (PC level) is suitable for automatic switching between two power sources in emergency power supply systems with rated working voltages of 400V and below, a fixed frequency of 50/60Hz, and rated currents ranging from 16A to 5000A. This ensures the continuous, safe, and reliable operation of critical loads (such as fire loads) to guarantee uninterrupted power supply. Widely used in hospitals, shopping malls, banks, chemical plants,high-rise buildings, fire departments, and other critical locations where power interruption is not permissible.