Siemens | NEB1B040 | Circuit Breaker | 40A | 1-Pole | 277V | Bolt-On

Meet the Siemens NEB1B040 — a purpose-built 40A, 1-pole circuit breaker designed for dependable protection in commercial electrical systems. With a 277V rating and bolt-on mounting, this unit is built for straightforward installation, reliable performance, and drivers of ongoing safety in maintenance, retrofit, and replacement projects.

• Amperage: 40A
• Poles: 1-Pole
• Voltage: 277V
• Mounting: Bolt-On
• Part Number: NEB1B040
• Type: Circuit Breaker

Why this Siemens NEB1B040 stands out

This exact part number delivers precise compatibility, reducing the guesswork that can come with replacements. The bolt-on design enables quick, secure installation and solid bus-bar contact, which translates to reliable protection without complicated wiring modifications. With its 277V rating, it’s well-suited for many commercial circuits and lighting applications where higher-voltage protection is required.

Ideal use cases

• Maintenance: Replace worn or tripped breakers in existing Siemens panels to restore uninterrupted service.
• Retrofit: Upgrade or modify panel layouts with a compatible 40A, 1-pole, 277V bolt-on breaker.
• Replacement: Fast, accurate swap for a failed circuit breaker that matches 40A, 1-pole, 277V specifications.

Compatibility and ordering guidance

Before purchasing, confirm fit and ratings for your panel. The part number NEB1B040 is the most reliable reference for compatibility, ensuring you’re selecting a breaker that aligns with your existing electrical architecture and safety requirements.

Designed for professionals who demand precise specs, dependable performance, and a straightforward install, the Siemens NEB1B040 40A 1-Pole 277V bolt-on circuit breaker is a practical, durable choice for protecting critical circuits in commercial environments.