The regular (mechanical) relay is generally cheaper. They can usually handle more current and they don’t care as much about AC/DC. A solid state relay doesn’t have any moving parts, but if you aren’t toggling quickly, a mechanical relay can toggle enough times for it to not matter. Mechanical relays can toggle a few tens of thousands of times, so you will have a hard time breaking them if you turn them on and off at the start/end of a job.
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