We have two UPS units in our data center. All of our servers and network equipment have dual redundant supplies, one plugged into each UPS. We recently had a failure of one UPS. The servers and network hardware were not affected because they were still being powered by the other UPS. However, we have some equipment that only have a single source of power with no option for redundant power. They lost power during this failure. Are there any devices that could allow devices like this to plug into two power sources for redundancy?
SnapOverflow
Something list this APC Rack-mount Transfer Switch, maybe?
Yes - a transfer switch - something like this or this
Some equipment I've dealt with before, you could remove the standard AC power supply, drop in a DC supply, then use a special splitter cable to attach that to more than one external AC to DC power supplies.