Hi Larry,
My KID is also a Beta unit, and all original.
It came with, and still uses (the original) 30 A fuses, in all three positions.
Did not take the time to look at all of the KID Documents listings.
You are probably correct about newer KIDs using 40 A fuses, at least at certain locations ...
Did Search 'Kid', and 'KID fuses' nothing jumped out noting 40A fuses, but did not read every Post for each search hit.
Am sure that someone will chime-in with the absolute bottom line. 73, Thanks, Vic