ACP (East) A N Murthy identified the arrested man as Senapathi Raju (37), an auto-driver by profession.
Acting on tip-off, sub-inspector G Dali Babu nabbed Raju when the latter was trying to exchange the fake currency for genuine notes.
During the questioning, Raju told police that he procured the fake currency by paying Rs 2,000 to some people around six months back. But he could not swap it for real currency notes as the fake notes could be identified easily.