Originally Posted by Iceman
I bought a DPDT switch as I wasn't sure if an SPDT switch would do what I wanted, I know now blush

So what are the other side of the terminals used for on a DPDT switch?
Well, DPDT switches are often easier to get than SPDT anyway, particularly in high DC current ratings.

The other side is used to switch another electrically independent circuit at the same time. The DPDT configuration is also easily wired to be a polarity reversal switch, which has its uses.

Cheers,
Gadge

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