From Valve Developer Community
This entity is obsolete; its use is discouraged and it may only exist/function in older engine branches.
trigger_super_armoris a brush entity available in the Half-Life 2 series. This entity may have been an early version of the suit chargers used inside the Citadel, which recharge health and suit power faster than regular. Instead of recharging the suit to 200 however, this entity would recharge it to the value of the
sk_max_super_armorConVar (default 500). The engine does not recognize this entity because the CPP file is not in the solution.
In code, it is represented by class
CTriggerSuperArmor, defined in