Non-latching relay as an "AND" gate
Without knowing the internals have a non-latching relay, is it possible that one input closes while the other doesn't? Presumably it can happen if the contact gets dirty?


No, contacts A and B are not guaranteed to be in the same position, unless you use 'mechanically linked' or 'force-guided' contacts. These relays are usually used in safety related applications.

(Without having the detail of your application this is hard to answer, but you will probably need two relays to make a sequence.)