Product review (4 stars): doubt it's really genuine OEM FSP, but it's a good clone.
Ordered this because it said it was a genuine OEM FSP part (ordered from North America HVAC).  I was a bit ticked off when it arrived in a plain plastic bag (I've ordered FSP before, this had no FSP labeling on it) that only had a sticker with the 3949247 part number.  The 3949247 part number is also nowhere on the switch itself.  So I really have my doubts this is a genuine FSP product.

That being said, this switch appears to be a decent good clone.  Length, wire protector, plug and switch itself look like original (well the old switch part broke apart and pieces went everywhere so can't really vouch for that).  You'll need the 2 mounting screws for the switch from the old one so don't lose those.  It hooked right up with no issues at all and seems to be working great.  I just hope the switch itself is insulated well (can get water splashed on it easily) so that it lasts a long time.  So the 4 stars instead of 5 is because of my doubts of it being genuine FSP after being advertised as such.

Symptom of a bad switch is that the tub will fill with water and agitate, but it won't run the spin cycles.  If your switch falls apart like mine did you can unscrew the old switch, cut the switch off, strip the wires and twist them together (unplug the washer first!) and tape them up with electrical or duct tape so you can finish the washing cycle.  But be aware that it will be able to run the spin cycle with the lid up so keep yer hands out of there!