ABB XT1SU3125AFF000XXX Industrial Circuit Breaker

ABB XT1SU3125AFF000XXX is a Tmax XT series molded-case circuit breaker (MCCB) with a 125 A frame and a three-pole (3P) TMF (thermally magnetic) trip, intended for protecting three‑phase distribution circuits in industrial environments; this UL/CSA-listed device accepts standard front‑line/load‑side terminations, offers a compact footprint (approximately 5.12 in high x 3 in wide x 2.75 in deep) and a temperature operating range of -13 to 158 °F (-25 to 70 °C), and is suitable for use with typical three‑phase systems rated up to 347/600 VAC. The exact catalog number matches the XT1S family, with XT1SU3125AFF000XXX serving as the cross-reference for this 125 A, 3P TMF model, and some catalog entries document interrupting capacities up to 65 kA at 347 VAC, reflecting its robust short-circuit protection; the XT1S 125 TMF designation confirms the 125 A frame and thermal-magnetic trip, part of ABB’s Tmax XT lineup.