Siemens NMX3B700 Molded Case Circuit Breaker

Siemens NMX3B700 is a three-pole molded-case circuit breaker from the VL Series, rated 700 A at 600 V AC for heavy-duty, three-phase protection. It is bolt-on mounted and supplied without lugs, so installation requires compatible lug accessories. The device uses a thermal-magnetic trip unit to provide overload and short-circuit protection and is designed as a complete unit with a non-interchangeable trip mechanism, ensuring consistent protection characteristics across installations. With a 35 kA interrupt rating at 480 V, the NMX3B700 can safely interrupt fault currents typical in large distribution feeders and switchgear, and it is specified for operation in ambient temperatures up to 40°C. This MCCB is intended for industrial power distributions and large protective panels where Siemens VL-series breakers are specified, offering reliable protection for feeders or main circuits in demanding environments.