If I am not mistaken its for reverse. You need contactors to make it work properly. There are other controllers from curtis that have that too.
I knew contactors were used for reversing (when a transmission isn't present)... but I just assumed these were used on the motor power connections. Do you mean that contactors are used on the circuit that ties into this "additional" low voltage input spade connector???Usually contactors are used to switch the direction of the power through the motor so it spins in reverse and I believe yes at lower power so you don't kill yourself.