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The Sentry CW-16HF2 provides fail-over redundancy to single or dual-power supply servers and network devices. Exclusive to the Sentry Switched Fail-Safe family is its ability to carry loads on the A circuit, B circuit or both and to remotely manage the outlets.
Similar, but unlike a common automatic transfer switch, the Sentry Switched Fail-Safe unit is unique in that it contains two in-feeds with two banks of eight outlets each, for a total of 16 outlets across the two circuits.
The "A" in-feed routinely powers just the A1-8 outlets, and the "B" in-feed routinely powers just the B1-8 outlets. However, if the "A" infeed goes down, the "B" in-feed powers all 16 outlets and if the "B" in-feed goes down, the "A" in-feed powers all the outlets.
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 primary in-feed. The"Fail-Safe" method differs in that both circuits are routinely loaded, but only to half capacity. This results in less heat 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.