The 17-year-old boy was accused of abusing staff and refusing to return to his room about 7.30pm yesterday.

It was alleged the boy started swinging his arms at staff, hitting a member of the Correctional Emergency Response Team on the head.

A Community and Public Sector Union spokesperson said the staff member was not seriously injured and paramedics were not called.

New rules about young offender behaviours and expectations around behaviours were implemented this week to make the centre safer for staff.

The agreement came after a number of incidents of violence against workers in recent weeks.

Three staff members were last week taken to hospital after two separate assaults, triggering a health and safety cease work.

A partial lockdown was in place for several days as talks between the union, management and WorkSafe continued.

A 'zero tolerance' approach to violence against staff was key to the agreement.

"The Commissioner for Youth Justice and senior managers are continuing to implement a range of actions at the Malmsbury Youth Justice Centre in partnership with staff," a Department of Justice and Community Safety spokesperson said.

"Violent behaviour against staff in youth justice centres is absolutely unacceptable, and all incidents or allegations of violence or assault are referred to Victoria Police."

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