ABB S203U-K15 Molded-Case Circuit Breaker

ABB S203U-K15 Molded-Case Circuit Breaker is a three-pole, 15 A MCCB from ABB's S200U family, engineered to provide reliable overcurrent protection for three-phase loads in low-voltage distribution panels across industrial and commercial settings. It is rated for up to 240 V and offers a 10 kA short-circuit interrupting capacity at 240 V, with a thermal-magnetic trip mechanism featuring a K-trip characteristic to balance fast fault interruption with resistance to nuisance trips. This bolt-on device supports reverse-feed configurations and carries UL 489 listing with CSA/IEC approvals, while ABB catalogs reference identifiers such as E212323 and 162K859H01 to distinguish this specific 15 A, 3-pole model. In service, the S203U-K15 provides compact, dependable protection for three-phase circuits in panelboards and switchgear, helping safeguard conductors, devices, and downstream equipment.