PSK Power Supplies CUI Inc PSK Power Supplies are housed in compact packages designed for easy installation and deliver 3W to 22.5W power. The units are available in a wide range of options and provide overvoltage, overcurrent, and short-circuit protections. CUI Inc PSK Power Supplies offer an 85VAC to 305VAC input range, a 4000VAC input/output insolation voltage, and a -40°C to +85°C operating temperature range. The PSK power supplies are available in board-mount, chassis-mount, and DIN-rail configurations.