Dual power transfer switch electrical appliances (transfer switch ATS, also known as ATSE, is the English abbreviation of Automatic transfer Switching equipment.) An electrical appliance that converts one or several load circuits from one power supply to another. It consists of one (or several) transfer switch appliances and other necessary appliances for monitoring the power circuit and automatically switching one or several load circuits from one power source to another.
When the common power suddenly fails or fails, it will be automatically switched to the backup power supply through the dual power switch (the backup power supply can also be powered by a generator under small loads), so that the equipment can still operate normally. The most common ones are elevators, fire protection, monitoring, lighting, etc.