The ansul panel will have electrical contacts in it, usually a few SPDT micro switches.
The most common way I handle it is by the use of shunt trip breakers controlled at 120 volts through the ansul contacts.
Be sure to find out exactly what needs to be shut down.
In my area the power to the appliances under the hood and the make up air supply shut down but exhaust fans and lights stay on.
In other areas they want all power off, before you waste time and money find out for sure what your AHJ wants.
