Siemens NGB3B125 Bolt-On Circuit Breaker is a 3-pole, 125-amp molded‑case breaker from the NGB family, designed for bolt‑on installation in Siemens panelboards. It uses a thermal‑magnetic trip to provide long‑time and instantaneous overcurrent protection for 3‑phase circuits, and it supports panelboard mounting with bolt‑on connections and load‑side lug terminals for wiring. This unit is rated for up to 600 VAC configurations (600Y/347 VAC) and carries a 14 kA interrupt rating in the 600 VAC range.
