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Yes, the heat spreader is that big dang block of metal that sits on the M- bus bar. I heard that Aluminum can dissipate heat better, but also copper has a very high thermal conductivity, which I think means that it can suck the energy away faster from the mosfets/diodes, and then it's in contact with the aluminum plate that transmits the heat to the air more efficiently. (I think. hehe)
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