Back again, So I've been working on my project but I've come to the point where I need to invest in a snubber for my relay board. I'm not very good at electronics nor do I have very good knowledge on what i'm looking for so this is what I've came up with.
The circuit:
Relay board is 5VDC (obvious)
Relays are controlling 24VAC & 120VAC
Amperage: 24VAC <2A & 120VAC > 8A with 16A Peak
Alot of juice right? Thus the reason for the snubber. I prefer to use a diode in parallel with the relay to keep the current "snubbed". Instead of a RC snubber.
I found these two options in my search, just looking for opinions or better alternatives:
Option 1: NTE597
Option 2: 10CTQ150PBF
If I'm understanding your application correctly, your snubber will go on the coil side of the relay (next to the controller/processor). The other side (AC or higher voltage) doesn't matter.
The specific diode isn't really critical. A 1N4148 is a nice, cheap device to use for this purpose.
Alot of juice right? Thus the reason for the snubber. I prefer to use a diode in parallel with the relay to keep the current "snubbed". Instead of a RC snubber.
A diode across the relay contacts won't work because you won't be able to completely turn off the AC load. When the contacts close, you'll get full power to the load. When the relay contacts open, you'll get ½ wave rectified power to the load through the diode, no matter which way its connected.
I would suggest using MOVs. This will help protect from EMI/RFI by reducing contact arcing and prolong the life of the relay.
If I'm understanding your application correctly, your snubber will go on the coil side of the relay (next to the controller/processor). The other side (AC or higher voltage) doesn't matter.
The specific diode isn't really critical. A 1N4148 is a nice, cheap device to use for this purpose.
HTH.
That is a very nice diode. I'm not really good at finding things on the electronics side of things.
dlloyd:
A diode across the relay contacts won't work because you won't be able to completely turn off the AC load. When the contacts close, you'll get full power to the load. When the relay contacts open, you'll get ½ wave rectified power to the load through the diode, no matter which way its connected.
I would suggest using MOVs. This will help protect from EMI/RFI by reducing contact arcing and prolong the life of the relay.
Its a Sainsmart 8 channel solid state relay board with Phototriac isolation. If I understand correctly it should already be protected due to the phototriac isolation but i'm trying to add "insurance" for worst case scenarios. The board I have might have them already but If so I don't see them on it. It isn't an exact match to that one, but very close. I have seen other boards close to that one with a built in snubber but they were mechanical relays not solid state.
