This is from an SMPS from a storage server array. The main SMPS was on a different board, and screwed into the two tall terminals. The other shorter terminals linked to output of a small DC-DC converter module that plugged into the largee 4 pin header. I found odd because they had some small logic pins on the header. They went clear to the other end though the board 2-3 times in spots, and some just return to some outputs for sense or something. Another I think to turn it on went to a SMD transistor then back to the small PCB on the side that connected to the SMPS.
It had long thin case like length, width of the PCB, and about 4 in high. Seems of for basically being a SMPS like a PC would use. It has some diagnostic lights, etc so I could see being marginally more complex, but I don't see why they made it like that. Every SMPS I have worked on output is filtered right off the transformer. This had an SMPS running like 54V output, then running DC-DC converters. This had no input for any sort of 48V battery, etc.
Was made by or for Hitachi Data Systems which I think is a japanese company.