Product review (5 stars): great working replacement
The item fits perfectly.
The reason some switches has 3 wires and some only 2 is because some dryers lights a lamp when the door opens,some don't
Obviously,the extra wire is the connection to the lamp.
They use the same connector for both,and the wiring is done in such a way that you can use use the 3 wires model in a 2 wires dryer setup,and viceversa,only thing is the light won't light up in those because it lacks the extra connection.