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Actually, this IS a DPDT switch. You are correct that it is called an on-off-on switch, if it is center off, but it is not a busted single throw switch. The number of throws refers to how many outputs a single input can connect to. In this case the center input can connect to either the top end, or the bottom end, thus is has two throws. It has two poles because the pins are not connected internally, so each side of three pins is basically a single pole double throw switch. There are different versions of this switch depending on any the internal connections, including ones that have the crossover shown here wired internally to the switch already. So you have the read the printing on the side of the switch to determine which one you have. The on-off-on is most common.
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