MEAN WELL HEP-480 480W Single Output Switching Power Supply series is designed to operate in harsh environments, including high humidity, high vibration, and dusty or oily conditions. This MEAN WELL series is housed in an aluminum case and fully potted with heat-conducted silicone. HEP-480 offers up to 95% efficiency, allowing these power supplies to operate between -5C to 6C under free air convection.