Which statement is true regarding the operation of a closed transition transfer (CTT) ATS?

A closed transition transfer (CTT) Automatic Transfer Switch (ATS) operates by making a momentary connection between the normal power source and the alternate power source before fully transferring the load. This behavior allows for a seamless transition that helps maintain power without significant interruption.

The statement that the transfer from the normal to the alternate source is identical to that of an open transition transfer (OTT) ATS highlights that while the method of connection differs, the overall goal of maintaining power during transfer remains consistent. The difference lies in the momentary parallel operation during a closed transition, which helps minimize the impact of switching.

The statement regarding the ATS comparing utility stability before retransferring indicates that the equipment ensures that the utility power is stable and adequate before switching back from the alternate source to the normal source. This ensures a reliable power supply and further prevents unnecessary flickers in power when reverting to the normal source.

The mention that the Uninterruptible Power Supply (UPS) operates in battery mode during the initial transfer underscores a critical operation strategy. In conditions where there's a potential power disturbance during the switch, the UPS provides power as a backup, ensuring that sensitive loads remain powered until the transfer is complete.

All of these statements accurately describe characteristics of the operation of a closed transition