Cutler-Hammer 1P 277V Bolt-in Molded Case Circuit Breaker. This is Often Found in PRL2a 480Y/277V Panelboards as a Substitution for GHB Single Pole Branches. The GHQ is Rated for AC APPLICATIONS ONLY, Resembles a BAB Frame With a Load End Attachment and Bolts In Like the Other GHB's in The Panel. To ADD OR REPLACE 1 Pole Breakers USE Type GHB Breakers. Bus connection screws are NOT provided with this item.