Most modern active protection systems (APS) are unlikely to be able to defeat full-caliber AP rounds fired from a large-caliber tank gun. The APS can defeat the two most common anti-armor projectiles in use today: HEAT and APFSDS. The defeat of HEAT projectiles is accomplished through damage/detonation of the HE filling or damage to the shaped charge liner and/or fusing system, and defeat of APFSDS projectiles is accomplished by inducing yaw/pitch and/or fracturing of the rod. Due to the AP shot/shell's high mass, rigidity, short overall length, and thick body, tungsten armor piercing are hardly affected by the defeat methods employed by APS systems (fragmentation warheads or projected plates).
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