A 36 Volt Coil Contactor is usually used with 36 Volt Battery Pack
Systems.
You could tap into 36 volts of your Battery Pack to
switch Higher Voltages but is not recommended as this could cause some
Batteries to become out of "Sync" with others in your pack. Also if
these batteries become low in voltage it could cause the On/Off
Contactor to cut on and off.