Hey there,
I would like to control a popkornmaschine with a relai and looking for some advice.
As you can see on the picture the popcorn maker has 1200W.
With AC single phase, 1200W, 240 V, a power factor of 1 I have 5 Amps and the Relais in the second photo should work. The relai module goes till 10 A right?
Now I want to connect a Schuko Power cable to the relai.
The Schuko Power Cable has three wires: the brown(phase), blue(zero-conductor) and yellow-green (ground).
If I want to connect it to the relai I just cut the blue cable and lead it through the relai.
Is this correct?
Looking forward for advices!
I wonder are you in Europe using 240 volt or is it an industrial machine. As per your last statement regarding blue as being zero conductor. In North America if its 240 volt you would have 120 volts on both blue and brown in which case you would need a double pole relay. Normally you cut the hot line/lines and feed that to relay contacts. Being AC you could use a solid state relay that can be controlled directly with Arduino output.
If I want to connect it to the relai I just cut the blue cable and lead it through the relai.
Is this correct?
Usually, you should switch the "hot" wire (brown?) so there's no voltage on the appliance when it's powered-off.
If you break the neutral connection, no current will flow and it will be off, but voltage is still present at/inside the appliance.
"Schuko" means you want to use a plug to connect the machine to mains. (You are from Germany I suppose). So turning around the plug exchanges the blue and the brown wire. You cannot tell which one is "live".
It does not matter whether you switch the "hot" side or the other as long as the machine is not opened when plugged in
olf2012:
It does not matter whether you switch the "hot" side or the other as long as the machine is not opened when plugged in
Ok, I cut the blue wire and it works with the relai I posted in the picture in the first post.
But in regards of DVDdoug:
I guess I cut the "zeor-conductor". so there is no current flowing but still voltage on the tool.
Is this a problem.
This popkorn maker shall be activated in public so it should be safe, and possible checked as "positiv" by a "professional electrician".
Every coffee machine uses a simple switch which only interrupts one line. This is not a problem because you cannot touch any part of the internals.
You should have it checked if operating it in public, good idea 
In many countries, if the machine "plugs in to a power outlet" it would be required to switch both conductors, regardless of whether or not you can "touch" the insides. :o
Along with this, if the circuit involves a motor, it may be better to use a contactor in place of the relay.
