Home » English riddles » Wiring and Cabling » Wiring Riddle No.3 – Auto-transfer switching control diagram » Reply To: Wiring Riddle No.3 – Auto-transfer switching control diagram Reply To: Wiring Riddle No.3 – Auto-transfer switching control diagram 2021-08-03 at 11:08 am #2973 buchio good day sir Can i use a contactor to connect automatic changeover transfer switch?