CUI Inc PSK-4 Series Internal AC-DC Power Supplies offer a universal input voltage range from 120VDC to 431VDC and high efficiency of up to 82%. These power supplies feature a variety of protections, including continuous short circuit, overcurrent, and overvoltage. PSK-4 power supplies have an operating altitude of up to 5000m, a no-load power rating of <0.075W, and an overvoltage category of OVC II and OVC III. CUI Inc PSK-4 Series Internal AC-DC Power Supplies provide a 4W maximum output power rating, 1.2A maximum output current, and -40°C to +80°C operating temperature range.