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Technology

UPS (backup power supply)

Plain-language definition

Backup battery source to bridge power failure.

Technologycategory
September 5, 2026updated

UPS supplies power during a mains outage, typically for minutes. In security it is essential for PoE switches, NVR/VMS servers, network elements and communication converters.

Without UPS this is what happens

  • A CCTV outage may interrupt recording during an incident.
  • Communication will fall to the external reception center or responsible persons.
  • “Fail-safe” doors are unlocked at the worst possible moment (depending on the type of installation).