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+[title] What is this heatsink?
+[* black] The switch with the push button that engages with the black rod is shown here.
+[* black] The heatsink, or what I take to be a heatsink, is also clear.
+[* black] I unscrewed the copper plate and there was a residue of white heatsink compound below, so that seems to confirm my inference. I could not disassemble further without destroying the switch.
+[* black] I had not encountered a heatsink built into a switch before, so I would like to know why it is needed. Maybe there is some active protection device built in, but that seems unlikely at this cost point.
+[* black] My switch was open circuit on the neutral side, so I looked for replacements. I found a candidate but without an heatsink, and with no specifications. I would have tried, but one of the stator windings was also open circuit.
+[* black] One of the brush connections can also be seen in the background in this picture.

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