Integrator note — K-curve supplemental protector
The ABB S202-K40 is a 2-pole miniature circuit breaker from the S200 series, rated 40 A with a K-curve trip characteristic and a 277 V AC maximum voltage. Its 6 kA interrupting rating and UL 1077 supplemental protector listing make it suitable for branch-circuit protection in control panels where the upstream device provides the main fault clearing.
What the K-curve means for your load
The K-curve trips magnetically between 8× and 12× rated current (320–480 A for this 40 A breaker). That range is designed for inductive loads — motors, transformers, solenoids — where inrush can exceed 6× but stays below 8×. It avoids nuisance trips on start-up that a B- or C-curve might cause, while still providing short-circuit protection tighter than a D-curve. For a 40 A breaker on a motor branch, the K-curve is a practical choice when the motor full-load current is around 32–36 A and the inrush is under 480 A.
Compliance documentation
Listed as a UL 1077 supplemental protector and CSA 22.2 compliant. The manufacturer typically provides RoHS and REACH declarations on request for this series.