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The WS13 is specifically stated to be a non dimmer. Switching is accomplished with a relay so it could not possibly be a dimmer. This switch also states that it will work with LED lamps.
Maybe it is "asking" whether you want to define the switch as a Lamp or Appliance(?) Does AHP have an "all lights on" function?
Yes it sure does, and it would make sense that the "A" and "L" designations are there for that reason
After going through the list of module possibilities, never did find WS13, I tried 20 amp heavy duty Appliance module and it worked