The Mean Well RD-125-1224 is a part of Mean Well's series of redundant switching power supplies. These supplies are designed to provide uninterrupted power to critical systems in the eventuality of a main power supply failure. They feature a highly reliable DC-DC switching power supply and an isolating transformer. The RD-125-1224 can supply up to 40A of current with a total power output of 125W for a wide range of applications, including industrial automation, medical, and communication systems. It also includes safety approvals from various agencies, including UL, CUL, TUV, CB, and CE.