There is no switch per se, but they have an "off" position -- fully
counter-clockwise -- that shuts the lamps fully off. I opened one
briefly to see how the connector attaches to the circuit board (it
unplugs so you can pull it off to attach the wires then plug it back
into the box) and they are more than simple rheostats within, they have
additional parts and are more sophisticated than that.

The dimmer is rated for 8 amps, so it might be good for other types of
loads although I don't know how it would fare if asked to drive a
capacitive or inductive load.

The plastic cases are plenty sturdy, and the potentiometer has a nice
"feel" to it. Quite a good deal at $12.

--
Rocky J Squirrel

On Sun, 2011-05-08 at 20:51 -0700, Loren Busch wrote:

>  RE: LED Dimmers
> Mike, do those dimmer controls have a switch in them?