I have made large flat annular rings at the pad site, and placed vias in a ring within that circle. That allows more connections between the layers and soaks heat better. I have even ran a via or two down the trace when I have them siamezed that way.
Then, you could clamp a ring lug right to the board and directly solder the switch to the ring lugs.
=46R-4
=A0 =A0 =A0 FR-4
=A0 =A0 =A0 =A0 =A0 =A0 =A0/
=A0|_@_@_|--|_@_@_@_@_@_@_@_@_@_@_@|_________/ /________
x/ /x x x x x|
/x x x x x |
/x_x_x_x_x_x|
=A0 =A0 =A0 =A0 =A0 =A0 / /
=A0 =A0 =A0 .
=A0 =A0 =A0 =A0.
=A0 =A0 =A0 =A0 =A0 =A0.
underneath
Hmmm. 'lectronic engineers tend to think of the PWB as primary a bit too much. Think in terms of bolting the (weaker) PWB to the (strong) = busbar.
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