the switching power supplies are made by imported high-tech components, are widely used in automatic control field, such as led screen, industrial control equipment, communications equipment and instrument & meter. standards: iec950 uc1950, ul1012, tuv en60950 and emc lvd. input ac voltage: 85-132vac or 170-264vac alternatively or 85-264vac self-adaptation, full range. frequency: 47-63hz. power: 15w-500w with overload, short circuit and over voltage protection. ac input power suitable for the world, installed with emi filter, minimum wave. single, dual, three and four output. pfc in input circuit, output can be connect in parallel and series. din rail mounting for alternative.