>I must design a circuit that switches 230VAC at 6A max
>(0-crossing switching). This is a bit above the currents
>I am familiar with (up to ~1A).
>
>Is this within what can be done with a PCB, and how wide
>should the traces be? And for connectins to/from the PCB,
>can this be done with screw-type connectors, or should I
>use wires that end in a spade-type connector?

Traces to handle that sort of current are certainly possible as PCB traces 
only. Many years ago the company I worked for then made a linear power 
supply that had a PCB trace as the current sense resistor for a 5A limit. 
The trace was 0.2" wide IIRC and wound back and forth to get enough length 
for the desired resistance.

For connections I guess either type would be satisfactory, but commercial 
production seems to favour the spade lug, as I assume it is easier to deal 
with on the production line - no screwdriver to supply & get lost. 

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