"They were released on Z$1 000 each, except Moses Sigauke who was additionally charged with incitement to commit public violence and was ordered to pay Z$1 500," he added.
"The other two nurses were released yesterday (Monday) after paying admission-of-guilt fines at the police station."
The Zimbabwe Nurses' Association, which represents around 15 000 state nurses, called on their members to stage a strike against low wages at a time of galloping inflation.
Zimbabwe is facing its worst economic crisis in over a decade. Basic goods are scarce and the value of the Zimbabwean dollar has continued to tumble.
The strike comes as the southern African country experiences a surge in coronavirus cases, with 734 cases including nine deaths recorded so far - compared to 132 cases including four deaths at the end of May.