Siemens | NGB1K040B | Circuit Breaker | 40A | 1-Pole | 347V

Meet the Siemens NGB1K040B Circuit Breaker — a purpose-built, 40A, 1-pole protection solution designed for 347V electrical distributions. Built for reliability in maintenance, retrofit, and replacement projects, this unit aligns with Siemens’ renowned protection standards to keep critical circuits safeguarded without unnecessary downtime.

Key specifications

• Amperage: 40A
• Poles: 1-Pole
• Voltage rating: 347V
• Part number: NGB1K040B

Note: Confirm fit and ratings before ordering. Part number is the best reference for compatibility.

Why choose the NGB1K040B for your panel

This Siemens breaker is purpose-built for single-pole protection on 347V systems, offering a precise size, mounting, and electrical characteristics that align with Siemens panels and field installations. Using the exact part number helps ensure perfect compatibility with existing bus configurations and accessory kits, reducing the risk of misfits that can delay service or require unnecessary replacements.

Ideal use cases

• Routine maintenance in commercial or industrial panels with 347V distributions
• Retrofit projects where older protection devices need a like-for-like Siemens replacement
• Replacement for a failed 40A, 1-pole breaker within Siemens-compatible systems

Practical considerations and tips

Before installing, verify that the panel board and circuit channel are rated for 347V and that a 40A single-pole device is appropriate for the protected branch. Keep a record of the part number (NGB1K040B) for future maintenance and ordering to guarantee continued compatibility with your Siemens ecosystem.