Deleted, as no longer relevant.
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they must be unswitched sockets from a time when SP switching of sockets was more common than nowadays, the original MK Logic were SP switching for many years, one reason I didnt like them, but I did prefer Contactum and Crabtree and this was one of the reasons. So having to unplug gives you disconnection in both poles irrespective of make.!! Pedant Alert !! Pedant Alert !!
I assume secure means "must be unswitched".
I used to like them; much less bother.the must be unswitched switches