PCB Trace Width for 10A Servo Motor

[K1JOS]

I have a proprietary (no schematic) servo motor (12vdc, 10A startup) controller used outdoors that got zapped in a lightning surge.  I have replicated the circuit that uses 4 MOSFETS (2 N and 2 P enhanced channel -- IRL540N and IRF 5210) in a H bridge controlled by as PIC18F MCU.  I was surprised to see on the original board that the traces carrying the 10A +12vdc was only 2mm wide.  I cannot tell how thick the copper plane is but it doesn't look any thicker than most of the PCB's for low voltage applications.

Is 2mm wide enough or should the design be as wide as possible - like the large ground plane on the PCB bottom?

thanks in advance for any advise

[T3sl4co1l]

I would go with 2oz and 100-200 mil (2.5-5mm) width (or build the route out of polygons of similar average width).

If that's 10A continuous, that is.  If it's only pulsed for much shorter periods (0.1s?), you can get by with less.

Tim