What the K-curve means for your load
The K characteristic is engineered for motor and transformer circuits where inrush currents are higher than resistive loads. It allows a short-duration magnetic trip above 8 to 12 times the rated current (In), so a 16 A K-curve breaker holds through the starting surge of a small motor or a control transformer without nuisance tripping, yet still clears a hard fault. This makes it a common choice in industrial control panels feeding contactor coils, solenoid valves, and small drives.
The S204 K 16A carries a current lifecycle stage, meaning it remains in ABB's active portfolio.