"Acting on a tip off, police laid a trap and arrested the trio from Tronica City area," a senior police officer said.
The arrested have been identified as Ashok Gurjar, Mukesh and Deenu, aged between 29 and 35 years.
"Ramlubhaya, a manager with a private company, was robbed of Rs 8.7 lakh by two bike-borne assailants at gunpoint on October 10 when he was going to his factory with workers' salaries," the officer said.