A Line-Interactive UPS provides enhanced power protection by actively regulating voltage fluctuations without switching to battery power. It features an automatic voltage regulator (AVR) that corrects under-voltages and over-voltages, ensuring a stable power supply to connected devices. During power outages, it switches to battery backup to maintain uninterrupted operation. Ideal for small to medium businesses, servers, and networking equipment, Line-Interactive UPS systems offer a balance of cost-effectiveness and reliable power conditioning.