Siemens NGB3B020B Molded Case Circuit Breaker

Siemens NGB3B020B is a three-pole molded-case circuit breaker from Siemens’ NGB VL-series, designed for panelboard protection in low-voltage distribution. It provides thermal-magnetic trip protection with a common trip for all three poles and is rated 20 A at 480 V (three-phase). The device carries a short-circuit current rating up to 25 kAIC at 480Y/277 VAC, with a 14 kAIC rating at 600Y/347 VAC for alternative voltage configurations, reflecting the part's versatility across Siemens’ VL-series 480/277 V and 347/600 V systems. The NGB3B020B is intended for panelboard mounting and includes load-side lug terminals as standard, enabling direct connection of feeders; it is built on the NGB frame and is UL-listed for use in compatible Siemens low-voltage distribution equipment. This MCCB is suitable for protecting feeders and branch circuits in commercial and light-industrial panelboards where compact 3P protection at 20 A is required.