Final answer:
A Uninterruptible Power Supply (UPS) can protect equipment during power sags, providing emergency power and potentially voltage regulation.
Step-by-step explanation:
A Uninterruptible Power Supply (UPS) can protect equipment during power sags. A UPS provides emergency power to a load when the input power source or mains power fails. Unlike a surge protector, which only guards against spikes, a UPS provides battery backup to keep devices running without interruption during short-term power outages or sags. Additionally, many UPS units come with built-in voltage regulation features, ensuring devices receive consistent power levels despite fluctuations in the power supply.