Siemens NGB2B100B U is a 2-pole molded‑case circuit breaker (MCCB) rated for 100 A and up to 480 V, part of Siemens’ NGB family used for panelboard protection. It provides thermal‑magnetic trip protection with long‑time and instantaneous trip functions to guard against overloads and short circuits. The model carries a 25 kA interrupt rating at 480 V and is specified with load‑side lug terminals for panelboard mounting, making it suitable for Siemens panel installations and retrofit applications.
