ABB SU201M-K1 is a one-pole miniature circuit breaker with a K-characteristic, rated for 277 V AC and 1 A nominal current, designed for single‑phase branch‑circuit protection. It provides a short‑circuit breaking capacity of Icn 11.2 kA at 230 V (Icu up to 15 kA at 230/400 V), a rated insulation voltage Ui of 440 V, and an impulse withstand of Uimp 4 kV, with a nominal operating frequency of 50–60 Hz. The device occupies one module width (1 TE), accepts conductors from 0.75 to 25 mm² (multi‑wire) or 0.75 to 35 mm² (single‑wire), is IP20 protected, and operates from −25 °C to 55 °C; it is UL 489 compliant and manufactured by ABB Stotz S&J.
