The Automatic Transfer Switch transfers the critical load to the UPS when the utility line fails or is out of tolerance range

The Generator Transfer Switch automatically transfers the input to
the UPS from the utility line to a portable AC generator

The Automatic Bypass Switch acts as a fail-safe device by switching the critical load to the utility line if there is a fault.

The Manual Bypass Switch allows for a mechanical bypass of the UPS without affecting the power to the critical load