The S202-C63 is a 2-pole miniature circuit breaker rated 63 A with a Trip Curve C characteristic, meaning it trips at 5–10× rated current — the standard choice for mixed resistive and moderate inductive loads like lighting circuits, small motor starters, and control transformers where you need to ride through inrush without nuisance trips.
This breaker lives on a DIN rail inside a distribution board, motor control center, or sub-panel. It's sized for branch-circuit protection in 277/480 VAC wye systems (line-to-neutral on a 480Y/277 V supply). The 2-pole configuration covers a single-phase load or a two-wire branch off a three-phase system. When you're laying out the rail, leave a module space per pole — it occupies two 18 mm-wide positions. No gland plate or fill factor concerns beyond standard DIN-rail spacing.