The ABB S201P-C3 is a 1-pole miniature circuit breaker (MCB) from the S200 series, rated 3 A with a Trip Curve C characteristic. It mounts on a standard DIN rail and is rated for 277 VAC circuits with a 10 kA interrupting capacity per IEC 60898. The Curve C trip means it holds up to 5-10x rated current for short-duration inrush — typical for lighting, control transformers, and general-purpose branch circuits where moderate starting surges are expected.
What the 10 kA rating means
The 10 kA interrupting rating at 277 VAC tells you this breaker can safely clear a fault up to 10,000 A without welding contacts or rupturing the case. That's the standard for most commercial lighting panels and small distribution boards fed by a 25 kVA or smaller transformer. If your panel's available fault current is higher, you'd step up to a current-limiting breaker or a higher-rated series — but for typical 277/480 V branch circuits, 10 kA covers the majority of installations.