Cotek open frame power supplies 200w 400w cotek up 350 48 this 48v open frame power supply from cotek has a compact u profile 38mm and high power density offering an impressive 300w manufactured to a high standard with excellent efficiency and reliability while equipped with short circuit overload over voltage and over temperature protection additional first rate features include the 105degc long life electrolytic capacitors power ok signal free air convection for 300w and high