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The heavy phaser cannon was a weapon designed by Starfleet to be used on large ships such as the Galaxy-class and Sovereign-class ships for heavy combat when normal phaser arrays are insufficiently powerful.
In a alternate timeline, the USS Enterprise-D was refitted to include a heavy cannon under its saucer. It was a powerful weapon more then capable to rip through the shields and hull of larger Klingon warships. (TNG: "All Good Things")