Hi guys,
I am about to start a new machine build and want to fit proximity sensors rather than the old click style switches. I want to use Normally closed as they are safer with regards to wiring breakages etc. This supplier offers them in both NPN and PNP versions. I am not sure which is the correct type to get.Here is the link to the items:
https://www.aliexpress.com/item/32343901022.html

would any one be so kind as to take a look and tell me which type to buy please. If you scroll down he lists all the different types

thanks in advance.

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