What connector to use to non-permanently fix wires to large switch terminals?
The terminals you show are designed for solder to wire connection.

It may be possible to get Crimp Recepticals (the type that plug on to crimp tab connectors) of small enough size.



I know it is possible to get ones designed for 2.8 x 0.8mm tab connectors. Whether or not these will provide a reliable connection will depend exactly on the size of your tabs. I certainly wouldn't use them for long-term connection.