Bel Power Solutions Melcher HR Series is the world’s first DC-DC converter with input voltage range greater than 10:1. The series provides typical efficiency of 94% over the input and load range. Delivering up to 300 watts of output power with no derating over the ambient temperature range of -40 to 70ºC, cooler component temperatures result in higher reliability. Standard features include current share, 10ms hold-up time with internal capacitor, and reverse polarity protections. The series complies with EN50155, EN50121, and global standards for railway and safety.