20 Amp DP Switch on 32 Amp Ring Main

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I suspect there is a metal strip on the other side of the switch, which gets covered by the cover plate.
Possible but still not good as the rivets will have plastic between the pieces of metal they are connecting together. If ( when ) the plastic deforms over time due to pressure from the rivet then the pressure the rivet exerts on the metals it is connecting reduces and thus contact resistance increases and reliability of the contact reduces.
 

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