Siemens NNY3B100 1000A

The NNY3B100 1000A molded case circuit breaker from Siemens is a high-capacity low-voltage protection device designed for industrial and commercial power distribution systems requiring dependable circuit protection and operational reliability. As part of the Siemens VL Series family, this breaker combines compact construction with robust protection performance, making it suitable for switchboards, motor control centers, distribution panels, and heavy electrical infrastructure.

Rated at 1000 A with an operational voltage of up to 600 V AC, the NNY3B100 provides reliable protection against overloads and short circuits through its integrated thermal-magnetic trip unit. The breaker features a standard interrupting capacity of approximately 35 kA at 480 V AC, ensuring safe interruption of fault currents while maintaining system integrity during abnormal electrical conditions. Designed on a 1200 A NG frame, it offers high durability and long service life in demanding operating environments.

The three-pole configuration supports three-phase electrical systems commonly used in industrial facilities and large commercial buildings. Its bolt-on mounting design enables secure installation and simplifies integration into existing electrical assemblies. The breaker supports long-time and instantaneous (LI) protection functions, allowing precise coordination with upstream and downstream protective devices for improved selectivity and minimized downtime during faults.

Engineered for global applications, the Siemens NNY3B100 complies with recognized industry standards and is suitable for reverse-feed installations when required. The non-interchangeable trip unit design ensures consistent protection settings and reliable performance throughout the equipment lifecycle. With a wide operating temperature range and rugged mechanical construction, the breaker is capable of maintaining stable operation in challenging industrial environments.

Overall, the Siemens NNY3B100 1000A circuit breaker provides a balance of high current capability, dependable protection technology, and compact installation flexibility, making it an ideal solution for modern low-voltage distribution systems that demand safety, reliability, and operational efficiency.