but castillo14 we have the team already , but our problem is in technical installation . I can use 8 pins from the arduino to control all of the office . So my question is which is the better devices . that can be used for this purpose ?
When you active one equipment, can it be able to be used in manual mode?
You can use relays like below to switch power. Your big issue will be allowing normal manual control while still being able to control via an arduino. Also if you use dual control, how will you know if the device is on or off?http://www.ebay.com/itm/8-Channel-5V-Relay-Module-Shield-for-Arduino-uno-1280-2560-ARM-PIC-AVR-DSP-/281068143455?pt=LH_DefaultDomain_0&hash=item4170f7835f
Circuit breakers are _safety_ devices. Arduino relay systems are _hobby_ devices.Please don't even think of making any mix of this is an electrical fuse boxe of a house. The day that your arduino burns and your insurance company doesn't pay you a dime, you'll regret to have chosen the wrong hobby !
I want to know if there any kind of Hybrid Relays . not that one with 15A I need more than 240V/30A Relay to control my HVAC?
So just how much do you know about your HVAC? It probably already has a 24v controlled starting contactor.