ABB XT4NU4050AFFB00XXX 4 Pole Circuit Breaker

ABB SACE Tmax XT4NU4050AFFB00XXX is a four-pole molded‑case circuit breaker in the XT4N family, built for reliable protection of low‑voltage feeders and motor circuits in industrial panels. It is a fixed, four‑pole unit with front terminals and a thermomagnetic release (TMA), delivering precise current tripping for overloads and short circuits while maintaining a fully rated neutral path across all poles. In the XT4N250 class, these breakers offer up to 65 kA short‑circuit breaking capacity, making them suitable for demanding switchboards and motor control centers where selective coordination and quick isolation are essential. Typical applications include feeders, distribution boards, switchgear, and MCCs in manufacturing and infrastructure environments. The XT4N line emphasizes a compact footprint, compatibility with common XT4N accessories, and straightforward installation, enabling engineers to configure protective schemes that align with safety standards and system reliability goals.