Any resistor that pulls it down to zero or low volts keeps it turned off unless you add power. Low value ones waste energy and may get hot, too high value may not keep it at the 0v and off as wanted. The on off wire is "floating". So even a 1k resistor should be OK.
The switch just overides the resistor and turns it on. My switch is on the joystick. Its a latched switch obviously. Then you monitor the flashing status LED also on the joystick. The 2 momentary switches control the contactor seperately via a 12v supply to send it open or closed from the permanantly powered 48 to 12V inverter. So both the SSR and the switches work that relay.