Siemens NGB3B045 Three-Phase Bolt-On Circuit Breaker

Siemens NGB3B045 is a three-pole, bolt-on molded-case circuit breaker in the VL-series NGB family. It provides 45 A continuous current with a 25 kA interrupting rating at 480 V, suitable for protecting feeders and branch circuits in industrial power-distribution systems. The unit is bolt-on mounted, ships with line/load lugs included, and uses thermal-magnetic trip technology (long-time and instantaneous trip settings) to coordinate protection with upstream devices and downstream loads. It is rated to 600 V (AC) maximum and is designed for panelboard installations where compact, reliable protection is required in commercial and light-industrial environments. Typical applications include machine-control panels, power-distribution panels, and other equipment enclosures that require robust short-circuit protection and straightforward retrofit in compatible Siemens panels.