Passive Switchable Multiple

AB3 has A/B IO and 1/2/3 IO.

1/2/3 IO can be switch and connect to either A or B IO.

Also, A/B IO is normalized by 0V(GND). but 1/2/3 IO is not normalized by anyone.

That is useful for kill switch.

Example:

multiple with kill switch
signal router with multiple
etc...

https://centrevillage.net/products/AB3.html