Interrupting capacity and voltage rating
The 277 VAC rating aligns with 480Y/277 V three-phase wye systems — common in North American panelboards — so this breaker handles line-to-neutral faults on a 480 V service without cascading upstream. Two-pole switching means it opens both phases simultaneously, giving full disconnection for a 277 V single-phase load or a 240 V split-phase circuit.
