I'd have to look to make sure Mr H but some s/w's are a sealed unit others operate from a mech toggle to operate individual micro s/w's.
Some s/w's are a single piece but not fully sealed.Just depends on the spec / area of use.
The red ones as described I would say are a sealed toggle s/w the red stuff being the sealant around the toggle lever.
In any case you've given me a reason to get interested and have a sticky beak