Proton cannons were a type of heavy weapon emplacement used by both the Galactic Republic and the Confederacy of Independent Systems during the Clone Wars.
Proton cannons were a type of powerful energy weapon. One model was the Separatist J-1 proton cannon, a type of droid anti-aircraft cannon; a handful of these cannons were capable of taking down an Acclamator-class assault ship. Smaller craft were also capable of mounting proton cannons; Rogue-class starfighters could be equipped with proton cannons.
A gang of Pakiphantos outfitted their Z-95 Headhunters with proton cannons. Despite the small size of the Headhunters, their proton cannons were capable of piercing the heavy capital-class armor enhancements on the larger Millennium Falcon.
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