Which on-premises power component supplies instantaneous battery-backed electricity to network equipment, filtering voltage fluctuations and bridging the gap until standby generators assume the load?
Power distribution unit (PDU)
Automatic transfer switch (ATS)
Uninterruptible power supply (UPS)
Surge suppressor
The uninterruptible power supply (UPS) stores electrical energy in batteries and can deliver conditioned power to attached devices immediately when utility power is interrupted or experiences brownouts. This short-term supply, typically lasting minutes, maintains continuous operation and protects equipment while an automatic transfer switch brings backup generators online or administrators conduct an orderly shutdown. An automatic transfer switch only changes the power source and cannot provide energy itself. A power distribution unit simply distributes available power within a rack and offers no backup capability. A surge suppressor limits transient spikes but does not deliver sustained power during an outage.
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