Can I use a relay for my circuit.. If so how?

Question

Hi... I am trying to use a household thermostat, to control a series of 3 100W lights. Problem is that I think the wires inside the thermostat may be too small to handle that amount of current, and I am worried about burning out the thermostat... (and I'm cheap and I don't want to have to go buy a bigger thermostat) ... Is there a way that I can put a relay (or similar) in the circuit that will ease the strain on the thermostat, whilst allowing some of the current to operate the thermostat??

Also, I am wanting to use this circuit in both Europe (220V) and America.... (110V) Is there a way of doing ALL of the above AND have it work on both voltages????

references to web pages (cheaply) selling the necessary part(s) and idiot proof wiring instructions would be GREATLY appreciated...

Thanks :)

Answer 1

If you use a relay, you will still need a transformer to get the 24V maximum that the thermostat can switch. The transformer will need dual voltage connections and you will need a switch to change voltage.

You would be better off using an electric heater thermostat that can switch up to 220 volts like this one:

http://www.homedepot.com/webapp/wcs/stor...

Answer 2

yes you will need two relays respective of the voltage being used(220,110)

you will need a switch that will change the circuit to which the source voltage being used is allowed to run thermostat and lights (voltage must be stepped down for thermostats voltage and current). Problem is will you need to also have a separate set of bulbs.....I would think so. Knowing the purpose of system matters

Answer 3

You'll rue the day you try to put 110 (or 220) V through a thermostat made for 24 volts.  A relay will require a transformer and relay and that can be done.  There are high voltage thermostats and the use of one would simplify the wiring considerably.  I know of no quick and cheap way to enable dual voltage unless you simply switch bulbs.  220 v. bulbs would probably work on both voltages but would give you half the heat (and very little light) on 110 volts.