 A key advantage of this kind of armour is that it cannot be defeated via tandem warhead shaped charges, which employ a small forward warhead to detonate ERA before the main warhead fires.A new technology called "electric reactive armour" (also termed "electromagnetic reactive armour", or colloquially as "electric armour") is in development.This armour is made up of two or more conductive plates separated by an air gap or by an insulating material, creating a high-power capacitor.