ABB XT1NU3030AAA000XXX Miniature Circuit Breaker

ABB XT1NU3030AAA000XXX is a 3‑pole Tmax XT molded‑case circuit breaker rated for 30 A, designed to protect three‑phase circuits in low‑voltage power distribution. It is specified for use with AC systems up to 600Y/347 VAC and delivers an 18 kA interrupting capacity at 600 V, providing robust short‑circuit protection for industrial panels and equipment. The breaker employs a Thermal Magnetic (TMF) trip mechanism to respond to both overload and short‑circuit conditions, helping prevent damage to conductors and connected devices. Termination is copper, with top line‑side and bottom load‑side connections compatible with 14‑1/0 AWG conductors when using the specified lug kits (KIT FC Cu XT1 14‑1/0 AWG), and some catalog entries note availability with lug accessories for field wiring. The XT1NU3030AAA000XXX designation places it in ABB’s XT1 family (125 A frame), engineered for panel builders and machine builders needing reliable protection for feeders, motors, and control circuits up to 30 A. This model is aligned with UL‑standard safety expectations and is commonly used in commercial and industrial installations that require compliant, durable protection in a compact, three‑phase MCCB form factor. When selecting a replacement or designing a new distribution panel, verify that the 30 A rating, 600 VAC rating, 18 kAIC fault capability, and copper termination method match the system’s conductor sizes, fault current levels, and mounting constraints to ensure proper coordination and safety.