Tdk lambda enclosed power supply sws300a and sws600l series tdk lambda sws 300a 3 the tdk lambda sws 300a 3 is an enclosed single output general purpose power supply from the sws300a series this 33vdc 55a low cost power supply meets all the requirements of iec61000 4 the sws 300a 3 has been designed to withstand 30kv ac between input and output applications include factory automation process control nc machining automotive packaging equipment materials handling chemical processing