I don't see how the switch can blow a breaker, unless a wire falls off and
shorts to the other side of the line.
Hitting the switch while the saw is coasting shouldn't cause any more
current surge than starting from stopped. In fact, the surge will be
reduced, so I don't see why your action should have caused the problem.
I'm not sure how that motor is wound, but if it is a compound winding, with
the field in parallel with the armature, a bad brush contact would do what
you report. If it's series wound, all current must go through the brushes
and a bad brush would cause complete deadness.
The symptom is typical of shorted turns in the winding. That's a random
occurrence and probably means curtains, since parts are so expensive.
Repair would consist of either replacement of the field assembly (stationary
windings) or the whole motor.
Don't all these type saws have the electrical brake on them ? When the
switch is released it disconnects the power from the mains but then uses the
EMF (if that's the correct term) of the motor windings to charge a capacitor
or some kind of reverse winding to apply a reverse current flow to stop the
blade. So a bad switch is a real possibility and/or a bad cap (or other
device) used in the braking mechanism.
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