I have recently been tasked with the rebuilding of a resistive load center we use at work for testing telecom power supplies we have serviced. It currently has a series of relays that continually weld the contacts together due to being grossly underrated. I am currently sitting on roughly 80-90 new APT5010JN N-Channel Mosfets that I would like to use for this application but cannot seem to get a circuit I found on this site once (It was in post "NMOS FET with a negative drain"). I Believe it would serve my purpose allowing me to utilize the N-Channel Mosfets I already have in stock. What I am trying to accomplish is replacing the EMR Relays with Mosfets so that I can switch on and off 30A branches in my load back which is connected to a power supply that is producing -48V to -54V. We currently have a control box that is used to switch the existing relays with coil voltages of +12V. The schematic I am having trouble scaling was provided by member alexan_e and looked like this:
Any assistance would be greatly appreciated.