Depending on the connection of the appliance to be switched, you need an adapter to plug the switchable socket into the Swiss t13 socket and, if the consumer has a fixed cable with a t13 plug, a corresponding adapter. For appliances with a Euro plug (2-pole), you only need the adapter to the wall socket. The same applies to appliances with a cold appliance connection. In most cases, cables with earthed plugs are also included.

Yes, you need an earthed plug.