Phaser relays were a component of a starship or space station's phaser array. In 2371, Chief O'Brien modified the phaser relay of the USS Defiant to vaporize a comet. (DS9: "Destiny") In 2373, Worf and Nog worked on a way to increase the efficiency of the phaser relays of the Defiant. (DS9: "Soldiers of the Empire") In 2375, Julian Bashir suggested to Admiral William Ross that nadion radiation from a phaser relay could accelerate Koval's Tuvan Syndrome. (DS9: "Inter Arma Enim Silent Leges")