ABB XT1NU3125AAA000XXX Industrial Circuit Breaker

ABB XT1NU3125AAA000XXX is a 3-pole Tmax XT molded-case circuit breaker rated for 125 A in three-phase power systems, designed for equipment and feeders up to 480/600 V AC. This TMF (thermal-magnetic) device provides both overload protection and short-circuit interruption, enabling reliable disconnection during fault conditions. It is UL/CSA-listed for industrial panelboards and switchgear applications, and is commonly used to protect feeders and motors in manufacturing, processing, and facility automation. As part of ABB's Tmax XT family, the XT1NU3125AAA000XXX offers a compact form factor and robust performance suitable for panel installations and distributed protection schemes in harsh industrial environments. Alternate catalog numbers include XT1NU3125AFF000XXX, reflecting ABB's regional product variations. Use cases include protecting three-phase distribution circuits in motor control centers (MCCs), process lines, and other industrial electrical infrastructure, where fast, selective tripping helps minimize downtime and equipment damage.