Mean well 320w single output switching power supply rsp 320 series mean well rsp 320 12 the mean well rsp 320 12 is a 320w single output power supply from the rsp 320 series this acdc enclosed switching power supply has a low profile of 1u and is highly reliable it runs with an efficiency of up to 90 with forced air cooling by a built in dc fan with fan speed control function the rsp 320 12 is ideal for applications requiring energy savings no noise limited space for installation as