DC branch protection with K-curve selectivity
The S201DC-K1 is a 1-pole miniature circuit breaker rated 1 A at 60 VDC, with a K-curve trip characteristic and 10 kA interrupting capacity. The K-curve means the magnetic trip threshold is 8–12× the rated current — designed for inductive loads like DC contactor coils, solenoid valves, and small DC motor circuits where inrush is higher than resistive loads but lower than motor-starting curves like D-curves.
Peer comparison: S201MUC-K2
The closest functional peer is the S201MUC-K2 — same 1-pole DIN-rail footprint and K-curve, but rated 2 A with a higher interrupting capacity of 10 kA at 250 VDC. The S201MUC-K2 also carries a 277 VAC rating, making it a dual-use AC/DC breaker. For a panel originally specified around the S201MUC-K2, the S201DC-K1 drops into the same DIN-rail slot without rewiring, but the lower 1 A rating and 60 VDC maximum must be checked against the branch circuit's load and voltage.