The TMR 3-0521HI part of TRACO Power is a type of ultra-wide input range, regulated DC/DC converters with isolated outputs. The device can take in a wide range of inputs from 35 to 155Vdc and provide regulated isolated outputs in 12Vdc, 15Vdc, 24Vdc and other output voltages that range from 3.3Vdc up to 24Vdc. The device is also able to withstand voltage surges up to 200V, as well as accept input forks and reverse polarity. Additionally, the device is equipped with short circuit, over load and over temperature protection against fault conditions . The double insulation of the product together with its UL/CUL, CB, CE/EMC approvals makes it a secure and reliable product.