"Permission to operate is given after evaluation of conditions from other functions such as interlocking, synchro-check, operator place selection and external or internal blockings.
Features of the apparatus control function are:
Operation of primary apparatuses
...
Block/deblock of operation"

Source:
https://library.e.abb.com/public/98d655e0fc65d917c1257290007...

"Tillåtelse att manövrera ges efter en utvärdering av villkoren från andra funktioner som förregling, synkronismkontroll, val av operatörsposition och externa eller interna blockeringar.
Egenskaper hos apparatkontrollfunktionen:
Manöver av primära apparater
...
Blockering/avblockering av manövrering"

Source:
https://search.abb.com/library/Download.aspx?DocumentID=1MRK...

As to why an explanation of the term can be expected to be found in the above documentation for a bay controller:
"Ett manöverblockeringssystem realiseras normalt i fackkontrollenheter ('Bay controllers')"
https://www.svk.se/siteassets/aktorsportalen/tekniska-riktli...


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Note added at 9 hrs (2020-06-23 02:35:46 GMT)
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In the context of the example sentence, "operation blocking" works better, as in:
"circuit breaker opening, earthing switch closing despite operation blocking"
http://blog.ptsecurity.com/2015/07/digital-substation-takeov...