MisterBill2
- Joined Jan 23, 2018
- 18,167
OK, the circuit that I described in post#8 can still show when the contacts are open, and since the PR2 contacts would confuse things it will not matter because those only close when the PR4 contacts are closed. So that circuit will work if the low current relay supply is completely isolated. And it could even be AC, but it must be much to low a voltage to operate that PR2 coil device. normal mains frequency will be fine, or use DC.