main electric circuit breaker - aluminium+copper contacts - put antioxidant grease?
I will answer it this way, I use anti oxide paste on even copper to copper lugs a bottle last many months and I do this for a living. Is it required ? I think it should be with any dissimilar metals but it helps prevent aluminum threads from oxidizing here close to the coast. I find jobs that the lugs are ruined from oxides and have to be replaced fairly often especially with large commercial equipment unless a little noalox or deox was used, look on the contact pointed of many new breakers and you will probably see just a drop, why do they put it there? It extends the life of the contact point and improves reliability. If mfg's do it why shouldn't we?