It doesn't work well. Generally, iphones and ipads with protective cases do not affect charging, and protective cases are reserved for charging ports with openings. Some protective cases are very thick, if charging with a protective case affects the heat dissipation of the fuselage, easy to cause heat, so it is not recommended to charge with a protective case.
The protective case on the charger is called the insulation protective case. Spiral protective case. This protective case is mostly made of soft silicone, which protects key positions from major damage when it is set to both ends of the data line.
It works. The charging head protective cover prevents the charging cable from being damaged.