Emerson Network Power announced that two models of its Liebert NXL uninterruptible power supply (UPS) earned Energy Star qualification: the 480V input 800 and 1100 kVA models. Both models are available for 60 Hz applications across North America.

David Sonner, VP of marketing for North America at Emerson, said, “This Energy Star qualification further supports the fact that the Liebert NXL transformer-based system contributes to the overall efficiency of large capacity data centers.”

As part of its larger electrical equipment efficiency improvement program, the US Environmental Protection Agency (EPA) instituted its Energy Star for UPS program in late 2012, affecting UPS products rated greater than or equal to 1500 watts.

To qualify for the certification, the Liebert NXL was subjected to testing by a UPS-specific certification body recognized by the EPA. This certification process examines products based on average power, efficiency and efficiency variation for determination of steady-state, and UPS products meeting the EPA’s requirements use an average of 35% less energy than their standard counterparts.

The company's Liebert APM row-based UPS and 11 models of the Liebert GXT3 rack-mounted UPS earned Energy Star qualification last year.