The accused were identified as Neeraj Gupta (31), who owns a garment shop at Tughlaqabad in Delhi, Uday Bhan (30) from UP's Etah and Vinay (24) from UP's Farooqabad, they said.
During the interrogation, Gupta told the police that the trio had planned to rob the employee to overcome huge debt in business.
Their target, who is the field agent of a foreign currency exchange company was robbed while he was on his way to a money exchange office at east Delhi's Pandav Nagar area, police said.
When the field agent refused to do so, they have sprayed the chilly concentrated mixture and forcibly took the bag from him and fled from the spot, police said.
Based on a tip-off, the police laid a trap near Inderpuri area and all three accused were arrested. The police also recovered around Rs 2.45 lakh from their possession.