ABB SACE TMAX T5N-D 400A 3P DD6 Circuit Breaker

ABB SACE Tmax T5N-D 400A 3P DD6 Circuit Breaker is a fixed, three-pole molded‑case protective device in ABB’s SACE Tmax T5N family, engineered to protect power distribution circuits in industrial panels. The unit is rated for 400 A with a three‑pole configuration and is specified for up to 600 V AC and 50/60 Hz operation. The DD6 suffix denotes this specific variant of the T5N‑D line. This model uses a thermomagnetic (TMA) release, providing both thermal overload and magnetic short‑circuit protection. ABB’s official listings show 1SDA054437R1 as a T5N 400 A FF variant with TMA, along with related 3P models at In=400 A, confirming the intended application and configuration. Typical use cases include protection of feeders and distribution panels in industrial environments, such as manufacturing lines and power distribution boards that require a compact MCCB solution with robust protection characteristics.