I'm in the planning stages to build a box housing controls for a home brewery and would like to know if anyone can wrap my head around some things. I need recommendations on a transformer to take the 240v ac coming into the box and convert it to 9v dc, 1 amp for the arduino. I would like to use a terminal block so the 240v can be used on 3 separate 240v ac heating elements. The heating elements are 5500w, 3000w, and 1000w. All told, the heating elements will need to be on at least a 40 amp circuit breaker. I figure with all the bells and whistles I'm going to want a 50 amp circuit breaker. I am also needing to power a 120v pump (the march ac-5d-md). I believe the pump needs about 2 amps.
Any recommendations on what to use/engineering concerns would be appreciated. I'm a little concerned about heat within the box if I've got that much juice flowing through it. (it is a 16x16x8 plastic box)
I'll be using the arduino to act as a PID, switching relays to turn the heating elements and as a control to turn the pump on and off as it also controls actuators for the valves.
I'm not yet sure what to use to control the swagelok valves, so any reccomendations on servos/actuators would also be appreciated.