What is true of the offline type uninterruptible power supplies (UPS)?

The correct response indicates that an offline type uninterruptible power supply (UPS) routes incoming power directly to devices and switches during a power interruption. This describes the fundamental operation of an offline UPS, which only engages the battery to provide backup power when it detects a loss of utility power.

When normal power is available, the offline UPS allows the incoming utility power to pass through directly to connected equipment, ensuring efficiency by minimizing energy loss. In the event of a power failure or a significant voltage fluctuation, it switches to battery power to provide uninterrupted service. This operation implies that it acts as an intermediary that ensures continuity of power only when necessary.

This functionality is distinct from other types of UPS systems, which may have different methods of handling power interruptions and offer various levels of protection against power quality issues. The continuous monitoring and management of incoming power occur primarily in online UPS systems, not in offline ones. Thus, this answer accurately reflects the operational characteristics of an offline UPS.