Tracopower tel 30 series 30w dc dc converters tracopower tel 30 4812 the tracopower tel 30 series of dc dc converters features a 21 input voltage range a higher degree of efficiency and adjustable output voltage these converters are ideal for use in communications and network systems among other applications tracopower tel 30 4812 30w dc dc converter 36 75v dc in 12v dc 2500ma out