What is true of offline UPS systems?

The chosen answer highlights a key aspect of how offline UPS systems operate. Offline UPS (Uninterruptible Power Supply) systems, also known as standby UPS systems, typically connect the incoming power directly to the connected devices under normal conditions. This design allows the UPS to provide power to the devices while monitoring the incoming supply. When a power disturbance is detected, the system switches to battery backup, but during regular operation, it does not introduce any additional delay or interruption, enabling simpler wiring and maintenance.

The other options do not accurately describe the fundamental properties or functions of offline UPS systems. For instance, they do not provide continuous power without interruption; that characteristic is more typical of online UPS systems. Moreover, offline UPS systems are not limited to critical patient care applications; they are commonly used in a variety of environments where temporary power loss needs to be mitigated, such as offices and homes. Lastly, offline UPS systems do switch to battery backup once they detect power disruptions, precisely to protect connected devices from outages or fluctuations.