Found in the F6 D, F71 EK and other models. This switch shuts off power to the motor when the hopper is removed.
"MICRO SICUREZZA CAMPANA COMPLETO V220/110" - 220/110 volt hopper security micro (switch 600000088) - complete (assembly).
Fiorenzato part #: 900000183/R, revised to 900000886/R.