ABB T5N400BL Circuit Breaker

The ABB T5N400BL is a 400 A Tmax circuit breaker with a 3‑pole arrangement and an LS/I thermal‑magnetic release, built to protect low‑voltage distribution circuits from overloads and short circuits. It traces its lineage to the ASEA BROWN BOVERI T5N family and is now part of ABB's SACE Tmax portfolio, designed for use in panelboards, switchgear, and motor‑control centers. The 3P, 400 A rating supports protection for feeders and critical loads in industrial and large commercial installations, with the LS/I release providing coordinated tripping characteristics with upstream protective devices. For exact electrical ratings (voltage range, interrupting capacity) and mounting dimensions for the T5N400BL, consult ABB datasheets or the official distributor listing for this variant.