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In regards to pushbuttons, what is a positive opening contact block?

This term refers to normally closed blocks that can be forced open due to weld or spring breakage.   The E22, 10250T and E34 contact blocks have this feature.  M22 is tested to the European standards and meets their standards for what they call direct opening action, where in the N.C contacts are physically forced open by direct linkage with the pushbutton operator in the unlikely event of contact weld.  Basically the same thing - just different terms used in the U.S vs Europe.