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I am new to this site so sorry if it is not how it should be.I was wondering could you please explain (as if i was a five year old) a volt free contact within a commercial boiler. I hear they are voltage free and not connected to the main wiring or the boiler if this is true how does it...

I was wondering could you please explain (as if i was a five year old) a volt free contact within a commercial boiler. I hear they are voltage free and not connected to the main wiring or the boiler if this is true how does it communicate with the boiler and what is its purpose?, and can it only...