Kent:
You seem to be approaching fuse/breaker selection from the wrong direction. Don't cut and try to find a rating that doesn't blow. Instead, calculate your load, ensure your wire sizes are correct and then select the rating that is appropriate for your system. "Cut and try" may cause a chain of unforeseen problems as you progressively identify the next weakest link in your electrical system possibly via smoke and flames.
Each aircraft will be different. Just remember that you will have a continuous load on the e-bus and you will also have some transients. Your continuous load should be met by your secondary alternator, if equipped, (or you will be depleting your battery some) but the fuse or breaker must be sized to include the transients.
I have 10 fuses on my e-bus plus and another 5 on my B-bus (I have an E-mag and P-mag). My continuous load on the e-bus (includes the b-bus load) is 9.9. This includes 1.5 for panel lights which I can turn off if my battery starts getting too low. The total load is 13.4 counting all the transient loads (trim servos, SL-30 transmit, windscreen fan, stick isolator relay). I'm using Z-13/8 so I'll be able to fly well past the fuel endurance with this load.
The 9.9 gives me an IFR bird with 1 GRT EFIS, EIS 4000, 2 servo A/P, trim, com/nav and panel lights.
I have a 15 amp fuse for the e-bus.
Jekyll
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