Background: I have a step-down transformer P241-5-36, which is a single mains primary coil to 36V Center Tapped (18-0-18) secondary. I would like to use this transformer to build a linear regulated dual rail (+15V/-15V) DC power supply for DIY synth work. I'd like for both me and the power supply to not be destroyed if I happen to accidentally produce a short circuit on the secondary side. The data sheet says for my particular transformer, "36V C.T. @ 0.35A" under the "Secondary RMS Rating" column.
Question: Do I place a fuse on the primary or secondary coil, or both and should I use a 0.35A value fuse or something else? I think the fuse needs to be on the primary coil (though I'm not sure the value), but when the transformer spec identifies 0.35A at secondary, it is confusing me.
Research: I researched linear regulated power supply circuits and found the following schematics:
While these schematics all to very different things, they all share a commonality in that they show a fuse on the primary side of the transformer. I read through this post asking general safety questions about a PSU schematic. That individual's schematic showed fuses on both the primary coil AND secondary sides.
Proposed Schematic: Here is the schematic I plan to use for my power supply (up to the linear voltage regulators). It is dependent upon the correct location and value of a fuse - I took a guess here:
Please note: I included a switch to float ground because I may want to probe with my oscilloscope and connect the probe's ground clip to something other than ground on my circuits.
Thanks, EE Community.