Siemens AG MD63F800 Molded Case Circuit Breaker

Siemens MD63F800 Molded Case Circuit Breaker is an 800 A, 3-pole protective device in the Sentron MD63 frame, rated for 600 V AC service in industrial switchgear and distribution panels. It is paired with the MD63T800 trip unit, delivering thermal-magnetic overload protection with a 25 kA short-circuit rating, suitable for main or feeder protection in mid-size power systems. With an 800 A frame, this breaker is designed to interrupt fault currents in demanding environments such as manufacturing lines, processing plants, and facilities power distributions, while its 3P, 600 V design matches common industrial power architectures. The MD63F800 operates in conjunction with the MD63T800 trip unit to provide predictable tripping behavior under overload and short-circuit conditions, enabling quick isolation of faulty circuits and improved system reliability. Typical applications include panelboards, motor control centers, machine feeds, and other 3-phase distribution schemes where a robust 600 V class breaker is required. As part of Siemens' Sentron MD63 molded-case family, the MD63F800 ensures compatibility with MD63-series trip units and related accessories, supporting consistent protection across installations that demand a dependable 3P protective device at 600 V and 800 A.