I've been working on an Arduino project for a while now. I have coded it and got the Arduino performing all the required tasks.
It has to switch a relay based on my program between one and the other. I have made a paint drawing of the way I am wiring it. Basically, one power cord will be bringing in the mains power which will be bridged across two connections. So far, so good.
Now, I haven't implemented any of this yet, but from what I can gather, running an inductive load through one of these relays can be problematic. The relays have shortened lifespan due to voltage spikes and in some cases can compromise safety.
I looked at a few solutions: Arduino relay controlling a bigger relay and SSR's. From what I can gather, however, the simplest solution would be to implement a snubber.
I understand the basic principle (I think). The snubber only allows current through over a certain threshold; cutting the power to the relay and dissipating this power as heat. Seems like a good way to prevent ware on the terminals.
So my problem is I cannot find any resources on how exactly to make one of these? Can anyone help me with this? I think it involved a capacitor and a resistor inline but I am unsure what they need to be.
Here are some details:
Relay: 2x High-current relays, AC250V 10A ; DC30V 10A.
Fridge(measured myself): 243.5v, 1.22amp(running), 4.6amp(starting), 184.1 watts Fridge(on the sticker): 240v - 50hz, 1.2amp, 200w
Here is my dodgy illustration of what I am looking at doing:
Where would the snubber go here? I'm assuming bridging the positive and neutral wires at the back of the socket.
I understand this is probably convoluted so I am more than happy to elaborate or provide additional information.