I chose not to include a description of my project primarily because I didn't think it was pertinent, but now I see that was probably no the correct way to go. Nevertheless, I am trying to design an automatic dust collection system for a woodshop, loosely based on one designed by the guy on "I Like to Make Stuff." I plan to use an Arduino Uno with a Adafruit 16-channel PWM servo shield controlling about eight servos. These servos will open and close blastgates (via wired connections) based on around eight current sensing modules (120 and 240v). When a wired sensor senses current (a machine is turned on), this signal is sent to the Arduino which opens the respective blastgate then after some delay, a wireless (basis of my question) signal is sent to something which then activates the 240v/40A relay turning on the dust collector. When the machine is turned off and after some undetermined number of seconds, the dust collector is turned off then another time delay afterwhich the blastgate closes, and the system goes back to monitoring current sensors.
In my mind, the Arduino should be on the transmitting side due to the additional controlling and computing requirements. The receiver side simply receives a signal and acts on it by activating the relay ON or OFF. I am hoping there is either a wireless relay capable of 240v/40A or a self-controlling receiver (i.e., no requirement for another Arduino). The distance between transmitter and receiver is no more than 35-40 feet. I have thought about using a fob-type Tx/Rx system, but taking the transmitter out of the fob and trying to integrate it into the Arduino, but I'm not sure if I have the electrical knowledge to do something like that. Because of that I keep going back to some other system.
I hope this is enough information to help y'all help me. Again, anything would be appreciated and thanks again.