The 19.3m-long three-section vehicles will accommodate up to 132 passengers, seating 27. Warsaw Tramways says the fleet will be fully equipped to meet the needs of passengers with disabilities.
The LRVs will also be fitted with an onboard energy storage system and two units will be specially adapted for driver training.
The trams are due to be delivered in 2015 and will take the proportion of low-floor vehicles in the Warsaw Tramways fleet to 60%.
Since 2007 Warsaw Tramways has acquired 321 new LRVs, including 186 Swing vehicles from Pesa, the last of which was delivered recently.