Siemens ND63F120U Molded Case Circuit Breaker

Siemens ND63F120U Molded Case Circuit Breaker is a three‑pole, ND‑frame protective device in the Sentron line designed for industrial power distribution, configured to protect three‑phase feeders with a rating up to 1200 A and up to 600 V. It employs a thermal‑magnetic trip system to coordinate overload protection with rapid short‑circuit interruption, delivering a 25 kA short‑circuit rating at 600 V and accommodating line/load lug terminations typical of the ND63 family. This MCCB is intended for installation in panelboards, switchgear, and motor control centers where reliable protection of large three‑phase circuits is required, with a compact molded‑case design that supports straightforward mounting within Siemens distribution assemblies. Applications include feeders to heavy machinery, distribution panels in industrial facilities, and other high‑current electrical installations requiring robust, code‑compliant overcurrent protection.