Siemens NGB1B040B 40A 1P 600V Circuit Breaker, Bolt-On | AmpState

Meet the Siemens NGB1B040B—an exacting choice for dependable circuit protection in panelboards, load centers, and broader electrical distribution setups. This 1-pole, 40 A circuit breaker is built for bolt-on mounting, delivering a secure, durable connection that maintenance teams and panel builders rely on. When a direct part-number match matters, this Siemens part (NGB1B040B) is a purpose-built fit you can trust.

Core specifications

• Manufacturer: Siemens
• Part Number: NGB1B040B
• Product Type: Circuit Breaker
• Amperage: 40 A
• Poles: 1
• Voltage: 600 V
• Mounting: Bolt-On
• Availability: Available from AmpState

Why this bolt-on breaker is a smart fit

• Direct part-number match: If you’re stocking spare inventory or replacing an existing install, NGB1B040B ensures quick compatibility without guesswork.
• Secure bolt-on installation: Designed for robust mounting in panelboards and distribution gear, helping minimize loose connections and downtime.
• Clear, single-pole protection: Targeted protection for a single circuit with a straightforward, easy-to-service design.
• 600V operational range: Suitable for a range of commercial and light industrial electrical distribution applications.
• Brand integrity: Leveraging Siemens’ engineering lineage for reliable performance in critical panels and centers.

Ideal applications and use cases

• Maintenance and replacement scenarios where a precise Siemens NGB1B040B is required to match existing panel configurations.
• Panel builders commissioning new distribution centers or retrofit projects needing a conforming, bolt-on breaker.
• Spare inventory planning for service teams handling Siemens-based electrical distribution systems.
• Any project or repair demanding a 40 A, 1-pole, 600V circuit protection solution with a direct part-number fit.

How it compares and practical tips

While many breakers offer similar specs, the NGB1B040B stands out for its bolt-on mounting and explicit part-number alignment with Siemens panel ecosystems. When sourcing, prioritize a direct match to avoid fit issues in dense panel layouts or legacy installations. For best results, verify the existing breaker type and mounting style in your panelboard schematics and ensure compatibility with your Siemens distribution equipment. If you’re unsure about fit, AmpState provides clear guidance to confirm compatibility.

Ready to secure reliable protection with a trusted Siemens component? AmpState has this NGB1B040B 40 A, 1P, 600 V bolt-on circuit breaker in stock. If you need help confirming fit or want to explore compatible alternatives for your specific panel configuration, send us a message and we’ll assist with precise matching to keep your project on track.