How to Connect up a Contactor Control so 2 way Switching can Control a Large Load Matt draws out how a contactor can be controlled by 2 way switch and be used to turn on many heavy current drawing loads. We see how many lighting points say in a factory can be turned on by a simple light switch via a contactor. NOTE: This is a wiring diagram and the cable runs in reality will be completely different. The rated value of the contactor will vary depending on the load current being supplied. 🔵 The 2