The fire broke out in the ground floor of the C-Block of secretariat at around 7.45 pm yesterday.
A security guard alerted fire personnel, who brought the situation under control swiftly, officials said.
Roads and Buildings Department officials said that short circuit was the probable reason.
A release from General Administration Department said no files were damaged. A switch board, a wall-mounted fan and a chair were destroyed while some old records, to be trashed, got partially damaged.