Where the conventional ERAs are only capable of defeating shaped-charge jets, Kontakt-5 can also defeat APFSDS rounds. Because of Kontakt-5, long-rod penetrators can lose over 30% of their penetration potential and the protected vehicle becomes immune to them.
This type of ERA can be easily recognized as it gives the vehicle outfitted with it a distinct 'clam-shell' appearance.
It is believed that while protected by Kontakt-5 ERA, Russian MBTs cannot be penetrated across the frontal arc by the M256 guns firing M829A1 APFSDS ammo.
In addition, thanks to their heavier (15 mm hard steel) front plate, the Kontakt-5 elements are harder to trigger by the precursor charges of tandem warheads, forcing the producers of tandem ATGMs to allocate more mass to precursor charge and, making an MBT more resistant to tandem HEAT warheads, as well.
This armor package is developed by NII Stali (Research Institute of Steel), the leading
Russian developer of applique protection packages; Russian Federation pat. No 2064154 from 27.05.92.
Specifications: Package mass: 3 t Added protection, RHA rating (as stated by NII Stali): vs APFSDS: 250 mm vs HEAT: 600 mm
For those who wish to know more about the principles of reactive armour operation, and about Kontakt-5 in particular, here is an excellent article about ERAs by Robb McLeod.