For improved protection, passive and active add-on armour is can be added on.

The add-on armour of these tanks had a different shape and was welded.

Add-on armour provides further protection for troops.

The 20 mm add-on armour on the front of the turret has a modular appearance with a triangular profile.

The A5 introduced a wedge-shaped, spaced add-on armour to the turret front and the frontal area of the sides.

Add-on armour in the form of heavy steel plates was bolted to the nose bulkhead to protect the crew against frontal fire.

Level II: add-on armour (including ballistic windows)

The tank's armour protection was also reinforced through the use of add-on armour on the tank's front glacis.

The modifications will significantly increase the vehicles protection with the installation of add-on armour, while improving mobility by fitting new suspension systems and a strengthened gearbox.

The SAUR 1 can be fitted with an add-on armour kit, raising the protection to Level 2.

The basic add-on armour pack provides ballistic protection against small arms fire and a heavier kit provides protection against ambush including mines.

The turret is stated to be immune to 0.50 caliber armour-piercing rounds at close range (100 meters) and protection is further increased when add-on armour is installed.

The upgrades include improved engine power, new torsion bars, fittings for add-on armour, air conditioning, and the VRS respirator system for NBC defence.

The Pandur II for the Portuguese Army is fitted with Steyr add-on armour that provides Level 4 protection according to STANAG 4569.

The T-55AM tank received better main weapon stabilization and sights, as well cast steel add-on armour blocks on the turret front-sides area (known as the "horse-shoes" or the "Brezhnev's eyebrow" armour).

To help prevent incidents of this nature happening again, Challenger 2s have been upgraded with a new passive armour package, including the use of add-on armour manufactured by Rafael Advanced Defense Systems of Israel.

Canada sent a squadron of Lord Strathcona's Horse (Royal Canadians) to Afghanistan in the fall of 2006, equipped with fifteen Leopard C2 tanks with add-on armour, as well as four recovery vehicles and four engineering vehicles.

The prototype, FV 4211 or the "Aluminium Chieftain", was fitted with a welded aluminium add-on armour, in essence a box on the front hull and front and side turret to contain the ceramic modules, of which box the fifty millimetre thick inner wall due to its relative softness could serve as their backing plate.