ABB XT4NU4080BFFB00XXX 4 Pole Circuit Breaker

ABB SACE Tmax XT4NU4080BFFB00XXX is a four‑pole molded‑case circuit breaker from ABB’s SACE Tmax XT family, intended for distribution panels that require a fixed neutral. The NU designation signals four active poles with a neutral, while the BFF code denotes a front‑terminal version for straightforward panel wiring. Built on the XT4 frame, this unit is part of a 250 A frame family, enabling robust protection for mid‑range distribution circuits. It supports Tmax XT protection options, including thermomagnetic releases (TMA) and, where installed, electronic trip units, offering flexible overload and short‑circuit protection schemes. The device accepts nominal operating voltage up to 690 V (Ue) and a rated insulation voltage up to 800 V (Ui), with a 50/60 Hz operating frequency, aligning with common industrial power systems. In practical terms, it provides reliable three‑phase protection with a fixed neutral in panel installations, featuring front‑terminal wiring and a clearly defined disconnection path in fault conditions.