I have a KW that I only use for lights/switch machines and relays. Originally I was using my Z4000 14 volt accessory output, but as I added more items the breaker would always trip. Took me a while to figure out the breaker was only rated for 4 ams. With no load the KW outputs measures what it is supposed to. What I have on the KW is 19 Lionel dwarf signals, all LEDs. Each signal also has a DZ 1008 relay. I have 33 dz2500 switch machines and the majority of them also have the push button controller. I have 3 Lionel double overhead signals, with 6 more dz1008 relays. I probably also have about 40 regular lights, street lamps, towers and the like. I do have a 10 fast blow fuse, it has never blown, but the measured output on each fixed output is 4 volts less than what it is with no load. To get 14 volts i have to use the B-U outputs and take the handle all the way up.
Is what is listed above enough to reduce the power that much. Since most of the above are LEDs I thought I was fine. No idea if the relays take must juice just sitting there.
I stumbled on to the issue when some of my relays stopped working. I thought they crapped out, but they were not getting enough juice to work. At that time I had all the above on the 14 volt fixed outputs, but it was only delivering about 10 volts. That is when I moved the above to the B-U outputs.
For my train power i use a ZWL, Z4000 and a postwar ZW, no problem with these, but I don’t have any openings to run the items at 14 volts.
My thought was to move up to a Z, I can then have four multiple outputs that I could adjust to fine tune of my operating accessories that I did not mention above. I currently use the B and C posts on the ZWL for 12 volts and 15 volts, for the majority of all my operation accessories.