USS Voyager firing tricobalt devices
Tricobalt devices were high-yield explosives capable of producing subspace disruptions.
Tricobalt Weapons were in use in Starfleet since the 2170s, However the More powerful Photon torpedo was used more often than the Tricobalt Device. The Einstein class Starships utilized low yield Tricobalt Micro-torpedo launchers Commonly referred to as "Phaser Turrets".
External link[]
Tricobalt device article at Memory Alpha, the canon Star Trek wiki.