The automatic transfer switch is composed of one or more switching devices for automatically disconnecting the load circuit from one power supply and connecting it to another electrical appliance. To be designed in strict accordance with national standards, NDQ3A series of automatic transfer switches are applicable to the power distribution system with the rated voltage of AC400V(50Hz/60Hz), which are widely used in construction, industrial control, telecommunication, power and other fields over the years, with the reliability and stability recognized by many customers.
