I want to be able to use a microcontroller to select the power source, from among two, for a 100A DC application.
All the relays I see are ON / OFF, rather than a selector.
So, I'm looking for something with 5 connections:
- Signal input (say, 3.3v digital, which when activated causes it to "switch")
- Power input 1 (which I'll connect to a battery bank)
- Power input 2 (which I'll connect to an AC Adapter)
- Power output (which I'll connect to the load)
- Common ground (for the voltage of the signal input)
I'm probably not searching for the correct piece of equipment, but I can't seem to determine what this might be called.
Best Answer
If the ground/common/negative side of your circuit can remain connected, then you need to "switch" only the "hot"/active side (voltage not disclosed) side. That can be done with a SPST (Single Pole, Single Throw) switch or relay.
However there are several things to be aware of if you want to do something like this:
You make it more difficult to answer your questions when you do not include the working voltage. It limits us to generic answers which may not be applicable to your situation.