Siemens NGB3B045B 45A 3P Circuit Breaker, Bolt-On | AmpState

Meet the Siemens NGB3B045B—a 45 A, 3-pole bolt-on circuit breaker crafted for reliable circuit protection in panelboards, load centers, and electrical distribution systems. This specific part, NGB3B045B, is designed to stay consistent with your maintenance and retrofit inventories, ensuring you can source the exact component you need without guesswork.

Key features

• Bolt-On mounting for secure, field-ready installation in Siemens panel assemblies.
• Three-pole configuration (3P) optimizes protection for three-phase electrical systems common in commercial and industrial applications.
• 45 A rated current provides dependable overcurrent protection for mid-size circuits while supporting efficient distribution.
• Siemens NGB series compatibility—part number NGB3B045B ensures a precise fit within your existing panelboard layout and cataloging.
• AmpState availability—ready-to-ship stock to support retrofit projects and routine maintenance planning.

Ideal use cases

Use the NGB3B045B for retrofit work where you need to preserve a consistent part number across your fleet or service schedule. It’s well-suited for upgrading or replacing 3-phase protection in panelboards and distribution panels, helping you minimize downtime during routine maintenance while maintaining proper circuit protection for commercial or light-industrial facilities.

Compatibility and support

If you’re unsure about fit or need to verify compatibility with your specific panel configuration, AmpState offers guidance to confirm the correct part number and ensure a seamless installation. Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.

Technical specifications

• Manufacturer: Siemens
• Product type: Circuit Breaker
• Amperage: 45 A
• Poles: 3
• Mounting: Bolt-On
• Part number: NGB3B045B

Available from AmpState, the Siemens NGB3B045B 45A 3P Bolt-On circuit breaker is a practical, dependable choice for projects that demand precise compatibility, straightforward installation, and durable protection for three-phase circuits.