Hi Marv, you can use the accessory power right off your Kato power pack. It's 12 VDC.
If you don't like that, or don't have that, you can use any small 12 VDC supply. Using a CDU to power your switches is recommended.
The current is determined by the resistance of the switch machine coil, not the capacity of power supply. Any 12V supply will deliver 0.6 A
into a 20 ohm load ( think that's about the resistance of the Kato coil), no matter how big the power supply (you could use your car battery).
Burning out a coil is caused by holding the button down too long. The CDU will prevent this from happening.
The Kato 24-840 switch controller will snap on to the side of your power pack, and incorporates a pulsed switch which won't burn out the
coil. They are about $10 each and will stack. It's easy peasy. Some folks like em, some don't.
Thanks for your input. Not using a KATO power pack. Digitrax DCC, so I need a dedicated power supply for the switches. Controlling the switches with momentary on, off, on. Sounds like I overthought what was needed.
For the Kato remote-contol switches, I control them with the Kato 24-840 switch levers, which snap together side-by-side. Using the 24-841 extension cords makes connections (to the switches) easy.
For power, I have the Kato 24-842 ac/dc converter connected to the leftmost switch control lever.
For a power source, I used an OLD Model Rectifier power pack going back to the 1970's that had been in storage for more than 40 years. I tap the 15v ac "accessory" output on the power pack and run it to the Kato 24-842.
The power pack isn't used for train control (I use dcc) -- it's just there to supply power for the switches.