Rated for 277 VAC with a 10 kA interrupting capacity, this breaker is sized for protecting motor circuits, transformers, and other inductive loads where high inrush currents are expected. The Trip Curve K means the magnetic trip threshold is set to 8–12x the rated current — higher than a C-curve (5–10x) but lower than a D-curve (10–20x). This makes it a good fit for motor starters and power supplies that draw a moderate inrush without nuisance tripping on startup.
Panel Integration
The 3-pole footprint occupies three module widths (17.5 mm each), so plan for roughly 52.5 mm of rail space plus wiring clearance on both sides.