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Thanks.
Oh what's the difference then? They both operate in the same way with the same idea a coil making contacts when energised. So when does a relay become a contactor?
Generally speaking a contactor is used to switch a load and a relay is used within control circuits.
But there is no hard and fast definition to either.
Generally contactors have higher current ratings and switching duties, but you can also get relays capable of switching 100's of amps.