Which component is responsible for providing a fail-safe in a UPS?

In a Uninterruptible Power Supply (UPS), the component responsible for providing a fail-safe is the power board. The power board plays a critical role in the regulation and distribution of power within the UPS system. It ensures that power is supplied smoothly and reliably, managing the switch between the main power source and the battery during an outage.

The power board contains circuitry designed to detect power failures and automatically engage the battery to continue providing energy to connected devices. This seamless transition is essential for maintaining operation during interruptions. So, when there’s an electricity failure, the power board activates the battery pack to ensure that the connected load remains powered, effectively creating a fail-safe mechanism.

Each of the other components, while vital to the operation of the UPS, does not provide the primary fail-safe function. The logic board primarily handles communication and control signals, the battery pack stores the energy needed during power outages, and the transformer is involved in voltage regulation and conversion but does not itself manage fail-safe operations. Thus, the power board is key in ensuring that the UPS functions properly as a fail-safe device during power outages.