Siemens NXD63S120A Molded Case Circuit Breaker

Siemens NXD63S120A is a three‑pole, 1200 A molded‑case circuit breaker in the Sentron ND frame, rated for 600 V AC service. This Siemens device provides overcurrent protection for feeders and equipment in industrial power distribution and is commonly used in panelboards and switchgear where high‑current protection is required. The NXD63S120A designation identifies the 3‑pole, 1200 A variant within the ND‑frame family, built for robust performance in demanding electrical systems and designed to integrate with Siemens’ broader protection ecosystem. Typical applications include large manufacturing facilities, data centers, and other facilities with substantial three‑phase loads, where reliable interruption of fault currents at 600 V helps protect wiring and downstream devices. For installation, select the appropriate mounting method and accessories per regional Siemens catalogs, and verify the exact trip characteristics for your configuration before ordering. This model is commonly cataloged as NXD63S120A across regions and reflects Siemens’ approach to scalable, high‑current low‑voltage protection within the Sentron product line.