The ABB S201MUC-C16 is a 1-pole miniature circuit breaker from the S200MUC series, rated 1.6 A with a Trip Curve C characteristic. The interrupting capacity is 6 kA under AC fault conditions and 10 kA on DC — the DC rating is notably higher, which matters for battery-backed or rectified supplies where a standard AC-only MCB would lack the arc-extinction margin.
The 1.6 A rating is a specific low-current value; verify the downstream load's full-load amps and starting surge to avoid nuisance tripping or insufficient protection. The 277 VAC rating covers line-to-neutral on a 480Y/277 V system, common in commercial lighting and panel feeders. The 10 kA DC interrupting rating is double the AC figure, which is unusual — it means this breaker can handle DC faults from battery strings or rectified supplies up to 250 V without requiring a series fuse.