Replace relay to open 5V signal

Hi, @bryanbwork
Welcome to the forum.

You are best to stick with the relay contacts to break the circuit as they will be the most reliable and the loop will be isolated from the Arduino,
You can find small PCB mount relays that can be controlled by a 5V signal.

Google;

5v low power relay
The search will give solid state devices, but there are coil tyupe relays as well.

Tom.. :smiley: :+1: :coffee: :australia: