Tripp Lite PDUMH30HVAT Metered ATS / Auto Transfer Switch PDU systems enable redundant power configurations for network devices with a single input cord connection. Set of two ATS inputs support connection to separate PRIMARY and SECONDARY power sources. The ATS normally maintains continuous output to connected equipment derived from the primary input. If the primary input fails or becomes unstable, the ATS will switch over to the secondary power source until the primary input is restored and stable. Super-fast switchover between primary and secondary power sources occurs within milliseconds. ATS functionality is supported by any two compatible AC power sources to support a variety of advanced redundant power networking applications.