Hull Armor
The hull of the BRM-3K Rys is built from aluminium (possibly the ABT-102 alloy from Nii Stali), which is then covered with bolt-on hardened steel armour. Without the steel, the aluminium protects against small-arms fire and shell splinters and the additional steel – which is concentrated on the front of the vehicle – is sufficient to stop 30 mm rounds fired at a range of 200 m. The glacis is sloped at 30° to increase the effective protection of the armour, and the trim vane at the front of the vehicle adds to the total armour. The belly plate is sloped at 43° and equipped with a dozor blade, which is thought to increase protection. There is a self-sealing fuel tank within the nose of the vehicle, which helps to defeat 25 mm APFSDS rounds. The turret walls are built from two pieces of aluminium that are curved and welded together before a roof is added. The aluminium is the same grade as the hull and spaced steel plates are welded to the turret so that it is protected against larger-calibre weapon systems such as the Mk 44 cannon. The sides of the hull provide protection from 12.7 mm AP rounds fired at a range of 300 m and the belly is corrugated, double-lined, and supported with additional ribs beneath the driver and passengers. However, the rear troop compartment is protected only against anti-personnel grenades and small mines. The vehicles can be fitted with bar armour to provide statistical protection against cumulative projectiles or RPG-7 type weapons. There is an additional armour kit available that appears to add spaced modules to the sides of the hull. It is thought to extend protection to 25 mm rounds fired at the sides of the hull and include air pockets to retain the amphibious capabilities of the platform. The vehicle can be obscured from view using the grenade launchers mounted on the turret front or by injecting diesel into the exhaust manifold; the latter option produces a smoke screen that is the same temperature as the engine, which helps to confuse IR-guided missiles.
Applique Armor
Available
NBC Protection
Crew protection is provided by an NBC system that includes the GO-27 radiation detector and a borated polyethylene lining; the latter absorbs neutrons and gamma radiation and the former seals the vehicle the moment harmful contaminants are detected. Some of the vehicleʼs openings must be manually sealed such as the bow-mounted MG ports, but the majority are closed automatically. The air is filtered and pressurised to further prevent harmful substances from entering the hull.
Fire Equipment
Fire protection is provided in the engine compartment and manned areas, four TD-1 temperature sensors monitor the engine, and there are eight IR sensors in the troop compartment. In the event of a fire, 114B-2 halocarbon extinguishers are activated in the engine compartment. In the troop compartment, the extinguishers are set to respond to any flame larger than 0.45 m². There are two handheld fire extinguishers in the front-left of the vehicle and a further two at the rear-right of the troop compartment.
Smoke Equipment
INA