The Vertiv Geist Basic Metered Rack ATS 15558 is a 15A, 120V 1U horizontal rack auto transfer switch (ATS). The 15558 has 10 NEMA 5-15R receptacles and a NEMA 5-15P plug providing 1.4kW in power capacity. If the primary power source experiences failure, the transfer switch automatically shifts to a secondary source to ensure uninterrupted service. Once power is restored, the unit switches back to the primary power source ensuring reliable power is distributed to critical IT equipment. The local LED display provides instant access to current (A) power consumption. Every unit is individually tested for reliability and functionality. It is also TAA compliant.