APC by Schneider Electric SUA500PDR-S uninterruptible power supply (UPS) 0.5 kVA 320 W 3 AC

User-replaceable batteries
Increases availability by allowing a trained user to perform upgrades and replacements of the batteries reducing Mean Time to Repair (MTTR)
Flexible Design
Available in a wide range of configurations to suit any operating environment
Multiple mounting methods
Allows for standardization on one product for use in different environments.
Plug-and-Play external batteries
Ensures clean, uninterrupted power to the loads when adding extra runtime to the UPS.
Automatic restart of loads after UPS shutdown
Automatically starts up the connected equipment upon the return of utility power.
Automatic self-test
Periodic battery self-test ensures early detection of a battery that needs to be replaced.
Cold-start capable
Provides temporary battery power when the utility power is out.
Power conditioning
Protects connected loads from surges, spikes, lightning, and other power disturbances.
Wide input voltage range
Designed for harsh electrical environments to save battery life.