I need to connect an AC (220v) power cable directly to a PCB. Of course I will use optocouplers to separate the high voltage. I am thinking to use one of the following connectors:
A:
B:
Which one of them is best to use? are there any other connectors/methods that can used ?
Thank you.
Look what connectors sit on motor driver boards for direct wire insert. Otherwise you have to configure the power cable with a cable shoe or the like before screwing that assembly to your connector.
With so massive connectors as you show I fear that your Arduino circuit will travel around with every move of the power cable. Did you take strain relief and bend protection into account? You don't want to power a kW load from that mains connection, will you?
After all I think that you should leave that connection and enclosing to a professional.
Hi @szakaria
Why? Are you sensing or controlling?
If sensing, are you looking for voltage or current?
If controlling, what are the characteristics of the load?
As @DrDiettrich suggests, this is a dangerous area from both a safety and litigation perspective! Nobody here should be giving advice that would result in risk of death or injury!
As a matter of principle, you should get a professionally designed module, professionally fitted at the device you are sensing/controlling and just have low voltage back to your processor.
Hi,
Can you please tell us the application of your project?
Do you need to measure the voltage level?
OR
Do you need to just know if the 220Vac is there or not?
Thanks.. Tom... 
Hi Tom, I am trying to measure the current. I am using zmct102 sensor.
Hi,
So the mains potential terminals will be connecting to a wire going through the donut hole in the current transformer.
Tom...
yes. I am trying this setup:
I thought that you were going to use a (much safer) SCT013 clip-on sensor.
Post#6 here.
Leo..
I used SCT013 (which is safe) for a "home project". However, this time I need to have the esp8266 and the sensor in the same enclosure.
5Amp is not that much.
(plastic) "PCB screw terminals" (Google/images) are the default choice for this.
5.08mm pin spacing should be able to take the right wire size.
Leo..
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