 The most common type is "explosive reactive armour" (ERA), but variants include "self-limiting explosive reactive armour" (SLERA), "non-energetic reactive armour" (NERA), "non-explosive reactive armour" (NxRA), and electric reactive armour.NERA and NxRA modules can withstand multiple hits, unlike ERA and SLERA, but a second hit in exactly the same location may potentially penetrate any of those.Essentially all anti-tank munitions work by piercing the armour and then either killing the crew inside, or disabling vital mechanical systems, or both.