Server Technology FSTS CS-2HF2A222A3 Smart Fail-Safe

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The Server Technology Smart Fail-Safe™ provides fail-over redundancy to single or dual-power supply servers and network devices. Exclusive to the Metered Fail-Safe is its ability to carry loads on the A circuit, B circuit or both.

Similar, but unlike a common automatic transfer switch, the Smart Fail-Safe unit is unique in that it contains two (2) in-feeds and two (2) outlets.

For example he "A" in-feed routinely powers just the A-outlet, and the "B" in-feed routinely powers just the B-outlet. However, if the "A" in-feed goes down, the "B" in-feed powers both outlets and the same if the "B" in-feed goes down, the "A" in-feed powers both outlets.


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This "Fail-Safe" method has several advantages compared to a standard ATS because it does not prohibit load balancing between the two supplied circuits. A standard ATS contains two-in-feeds, but runs all outlets from just one source, with the secondary source only being used once an outage occurs on the capacity. This results in less heat, less resistance, and consequently less of a voltage drop compared to the same load existing on just one source. Only when an outage occurs on one of the two sources will the entire load be applied to a single source.

NOTE - This transfer switch requires that the applied AC waveform from both power sources be in-phase with respect to each other.

  • Branch Monitoring:None
  • Branch Overcurrent Protection:
  • Branch Overcurrent Protection Type:None
  • Dual Input:Yes
  • High Retention Outlets:No
  • Input Current Display:None
  • Input Monitoring:Current (A)
  • Locking Outlets:No
  • Max Operating Temperature:40 °C
  • Fast Movers:No
  • Mounting:1U Horizontal
  • Outlet Monitoring:None
  • PDU Platform:
  • Power Pivot Input:No
  • Product Height (inch):1.75
  • Product Height (mm):45
  • Product Max Depth (inch):7.0
  • Product Max Depth (mm):178
  • Product Nominal Depth (inch):7.0
  • Product Nominal Depth (mm):178
  • Product Width (inch):17.0
  • Product Width (mm):432
  • Transfer Switch:Yes
  • Transfer Switch Phase Synch Required:Yes
Input Power Capacity (kW): 3.3
Input Plug Type: IEC C20 200-240V Inlet
Input Current (A): 20
Input Current Rated (A): 16
Input Nominal Voltage (V): 208
Input Phase: 1-Phase (L-L)
Input Cord Location: Horizontal
Total Outlets: 2
IEC C19 Count: 2

Part Code:

CS-2HF2A222A3

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Server Technology FSTS CS-2HF2A222A3 Smart Fail-Safe

Server Technology FSTS CS-2HF2A222A3 Smart Fail-Safe

The Server Technology Smart Fail-Safe™ provides fail-over redundancy to single or dual-power supply servers and network devices. Exclusive to the Metered Fail-Safe is its ability to carry loads on the A circuit, B circuit or both.

Similar, but unlike a common automatic transfer switch, the Smart Fail-Safe unit is unique in that it contains two (2) in-feeds and two (2) outlets.

For example he "A" in-feed routinely powers just the A-outlet, and the "B" in-feed routinely powers just the B-outlet. However, if the "A" in-feed goes down, the "B" in-feed powers both outlets and the same if the "B" in-feed goes down, the "A" in-feed powers both outlets.