I do not think you have described what you are doing very clearly. If you want a circuit that is literally exactly like a switch, you will need to connect the Maestro output through some driver circuitry to a relay. An easy way to do this is with the Pololu RC Switch. But is that what you want? What are you connecting this to?
apologies for not specifying, i am replacing an electronic trigger switch on a paintball gun.
i used to have a rc relay board from trossen, however i miss placed it and need at alternative solution relatively soon, and didn’t want to buy a new one.
my board looks very similar to this, i need to replace the brown and black wire trigger switch.
There is no reason to use the RC switch without MOSFET in your application, since its output is identical to the normal Maestro output. Do you understand how a TTL output is different from a switch?
Anyway, it is impossible for me to tell exactly what would happen if you replaced the switch with the Maestro output. Some circuits could work if connected like that, others would destroy something. I would not recommend experimenting like this unless you are willing to break your Maestro or your trigger.