What Curve K means for your panel coordination
The 2CDS273337R0427 SU203M-K10: The K-curve trips magnetically between 10× and 14× rated current — at 10 A that means instantaneous magnetic trip between 100 A and 140 A, which rides through motor start-up surges that would trip a B-curve breaker. Thermal protection follows IEC 60898 — the bimetal element handles overloads on a time-inverse characteristic, protecting the downstream cable and motor winding from sustained overcurrent.