Siemens NGB3B125 3-Pole Molded Case Circuit Breaker

Siemens NGB3B125 is a three‑pole, low‑voltage molded case circuit breaker (MCCB) in the NGB family, rated at 125 A for use up to 600Y/347 V AC. It provides short‑circuit protection with a 25 kAIC rating at 480Y/277 V and 14 kAIC at 600Y/347 V, using a thermal‑magnetic trip mechanism to handle overloads and faults. UL489‑listed for 3‑pole protection, this breaker is intended for use in commercial and industrial electrical distribution equipment, protecting three‑phase circuits up to 125 A. It is designed for mounting in UL489‑compliant panelboards and enclosures from Siemens and other compatible manufacturers, offering reliable isolation and protection in 600 V class systems.