Since the heater already has a contactor, I would think that you could put a switch on one of the coil wires.
What is the desired result?
Interrupting a coil wire shuts off power to the heating elements.
The coil is 240 volts and it is low current.
You can also install a separate relay outside the heater to shut off all power to the heater if you want.
11 kw is about 46 amps at 240 volts, so any contactor/relay has to be rated to the amperage.
You can use a relay with whatever coil voltage you want.
For example, you might have a 24 VAC or other control voltage available that you want to use to provide or disconnect power.
Note: I am not recommending or even suggesting that you can, or should, do this.
Modifying a piece of equipment might violate the safety rating of the equipment.
I am merely suggesting a possible modification that you can consider with an appropriate expert like an engineer to see if it will do what you want.
Do not rely on anything I say.
All work is based on your own research, your own decisions and your own risk.
You should consult with a qualified expert like a licensed electrician or an electrical engineer before making any modifications.
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