Typically the fuse is wired in series with the hot side of the transformer. This is me putting an example together so you can learn the process of troubleshooting. I was so concerned aboout the wiring as much as I was the diagnostic thought process.
Troubleshooting Low Voltage Short HVAC Basics
https://youtu.be/yr98GmVtQ7I
If you want to learn more about relays and transformers check out the video
https://youtu.be/-jA7kyS9EAI
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Supco POP3 3 Amp Circuit Breaker, Push Button
https://amzn.to/3BdtxyY
#lowvoltage #lowvoltageshort #hvactroubleshooting