noun
uninterruptible power supply; UPS
Technical term for a device that provides emergency power when the main power source fails.
サーバー室には無停電電源が設置されている。
An uninterruptible power supply is installed in the server room.
Compound of 無 (mu, 'without') + 停電 (teiden, 'power outage') + 電源 (dengen, 'power source').