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Automatic Transfer switch is a switch that automatically switches to another power source for a reason, general double Transfer switch is widely used in high-rise buildings, machine rooms, residential areas, hospitals, airports, terminals, fire, metallurgy, chemical, textile and other important places do not allow power outages.

Automatic Transfer switch, the full name of Automatic Transfer Switching Equipment (ATSE) . Here's how it works:
Definition: an appliance consisting of one or more transfer switches and other necessary appliances for detecting a power supply circuit and automatically switching one or more load circuits from one power supply to another, to ensure continuous and reliable operation of critical loads.