Greetings fellow electronics buffs! I have a spot welder project that contains a 120V transformer with a primary from an 1100 watt microwave. I have a 1 gauge 1 m long cable double wound as my secondary which delivers 2.1 V. Also present is a 9 V AC transformer powering both a control board for the spot welder and a second board which delivers 5 V DC to a constant cooling fan. My question is what type of fusing should I use and where should it be placed within the circuits? My understanding is a slow blow fuse of approximately 16 A should be after the main power switch feeding the main transformer due to inrush current. My assumption is a second fuse should be installed before the 9 V breadboard type transformer but I’m not clear on the amperage and if it should be an AC or DC fuse?? Thanks CAB