Want help in selecting relay for my projects

He also told me to go with the Solid State relay instead of the relay I was planning to use. He told me SSR could be directly connected to Arduino without any problems.

You need DPST - double pole, single throw. Like this
So you will need two SSR's to allow you to switch BOTH Line and Neutral

image

In the picture of OP, I see a heavy switch and a cylindrical object I take to be a capacitor, NO relay or contactor and 5 wires (2 red, 1 black, yellow and green). How are those wires connected to what?
Can you post a link to the datasheet or user's manual for the control box in reply #2?

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Yes, I have the diagram. The below diagram is provided inside the control box.

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