I have an application where the client wants power to test equipment in a specific room to be de-energized when the door to the space is opened, there are four disconnects that are located just outside the room I thought of either placing a contactor just ahead of the disconnect with door contacts on the door to open the contactors when the door is opened, another thought was to replace the disconnect with a molded case switch with shunt trip coil, the concern is the noise the contactors make everytime they cycle, I have never heard a contactor open and close just curious if they are ?noisy???