ATS

ATS accepts dual power sources in and provides power out to the outlets. For devices that only have a single power supply, an ATS gives them a way to survive the failure of one power source. As long as one of the two power inputs feeding the ATS is live, the outlets will still have power. There’s enough circuitry inside the ATS that it can automatically detect loss of power on one feed and switch to the remaining feed; there is also enough electrical buffer in the ATS to ensure that the connected devices stay powered while the switch over occurs.  In data center schemes, ATS strips are employed in-rack, sometimes in pairs where one ATS will be set to use power source 'A' primarily, and the other to power source 'B'. This helps to keep the load evenly distributed across A and B power networks.