The Shallows Of 4P3T
A List Of On-On-On Switches And Their Quirks
last update: Mar. 29, 2020
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Earlier or later you will need an on-on-on switch. Since not all of them are available everywhere, since they are termed differently by the manufacturers, since some of them are assembled wrong, since there is much confusion about this, I have compiled a (likely not complete) list. I did not add any links, since they retire faster than you can think.
Note: This is ongoing work. The list will be expanded if more specimen appear.
It is interesting that the data sheets are lousy as far as switching functions go. The Knitter switch appeared in two versions (verified!). Tyco looks and sounds suspiciously like a licensed KS product, although their data sheet makes no sense. It is not possible to make connections to the neighboring row of contacts.
I have contacted the local Knitter Switch distributor over the two different models, and they granted that manufacturing errors may have happened. There certainly was not a change in the models. Even more reason, to check before you use it.
Note that there are different pin spacing matrices, they are not 1:1 interchangeable. Funny that Knitter Switch deviates from the layout, that most others seem to adhere to, as far as the data sheet is clear about that.
There seems to be no universally agreed upon naming convention for the function of this type of switch. It makes no sense to name it a double pole switch as some do. (This discussion has been lead somewhere else earlier). Since it has four individually switchable signals, I would intuitively call it a four pole switch with three positions, thus a 4P3T switch, although this does not give you a clue on the switching functionality (such as on-on-on or on-off-on etc.) But neither the term DPDT does.
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 G&L L2K Wiring Mods Rev 4.1, 27-Dec-2017, by DavePlaysBass@hotmail.com, p.2
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