Siemens NGB3B100B is a 3-pole molded‑case circuit breaker designed for panelboard mounting in low‑voltage distribution systems. This Bolt‑On type from Siemens’ NGB family is rated at 100 A with a thermal‑magnetic trip for reliable overcurrent protection, and it is UL489‑listed. It is suitable for up to 600Y/347 VAC service and supports 480Y/277 VAC applications, offering an interrupting capacity of 14 kA at 600Y/347 VAC and 25 kA at 480Y/277 VAC. The unit’s bolt‑on connection provides secure installation in compatible Siemens panels, delivering coordinated protection across all three phases in a 3‑pole configuration.
