Switching a High Power & Low Power Load Together??

Thread Starter


Joined Aug 11, 2009
I have a PCB which is powered by 5v @ 1A and a motor pack which is powered by 50v @ 25A. Is it a good idea to switch these both "on" at the same time using a DPST switch such as this one? Or would there be a LOT of noise? Thanks!
Last edited:


Joined Jul 9, 2011
It is possible to switch both supplies with one switch. If it can cause any problems depends on your application and layout/wiring.


Joined Jun 7, 2009
generally not a good idea to combining sources. Your PCB will be sorrily messed up if there's a short at the switch. Your switch may be more than adequate, but in the practical world, shorts often happen due to improper strain relief, poor connections, etc.