Product review (1 stars): DOESN'T WORK ON ALL MODELS!!!
I have an older-model Sub Zero--the 211RFD.  This model originally required a 4-pronged switch, which turned OFF the condenser fans (when it turned ON the light) when the door was opened so that cold air would not be lost.  Unfortunately, they original part is no longer made.  In order to adapt this part to older units, you have to do 2 things:

1.  "Jump" the fan circuit so that the fan can continue to work when the door is open and closed.  The fan will still be active when the door is open, but...oh well.

2.  Create a small wiring harness to change the orientation of the original switch plug from horizontal to vertical to match the orientation of the new switch's male prongs (conveniently NOT shown in the photo).

I will upload photos of the prong sides of both the old and new switches, as well as instructions for rewiring the circuits to adapt the new switches.