Siemens | NEB2B040B | Circuit Breaker | 40A | 2-Pole | 600V | 35kA | Bolt-On

Engineered for dependable protection in industrial and commercial electrical systems, the Siemens NEB2B040B is a bolt‑on, two‑pole circuit breaker designed for reliable performance in 40‑amp circuits up to 600 volts. Built to support maintenance, retrofit, and replacement projects, this breaker helps you keep critical equipment protected with a precise, compatible fit.

Key specifications

• Amperage: 40 A
• Poles: 2‑Pole
• Voltage: 600V
• Interrupting capacity: 35 kA
• Mounting style: Bolt‑On
• Part number: NEB2B040B

What makes this Siemens breaker stand out

The NEB2B040B isn’t just another 40A breaker. Its bolt‑on design provides a secure, solid connection that simplifies installation in compatible panels, reducing setup time during upgrades or replacements. With a high 35 kA interrupting rating, it offers strong fault current protection for demanding electrical environments, helping minimize risk to both personnel and equipment.

Ideal use cases

• Retrofitting older panels to meet current safety and performance standards
• Replacing worn or damaged breakers in commercial or light industrial installations
• Upgrading circuits feeding motors, conveyors, or processing equipment within 600V systems
• Maintenance projects where exact part matching is critical for gatekeeping panel integrity

Fit, compatibility & installation tips

• Always confirm fit and ratings before ordering; the part number NEB2B040B is the best reference for compatibility with your panel.
• Ensure the panel supports a 600V, 2‑pole, bolt‑on breaker of this specification for a secure fit.
• Have a qualified electrician perform installation, power shutdown, and testing to uphold safety and code compliance.
• Store and handle the breaker in a clean, dry environment to preserve contact reliability and performance.

With the Siemens NEB2B040B, you gain a targeted, reliable solution for protecting 40‑amp circuits in 600V systems, backed by Siemens’ engineering heritage and a mounting design that streamlines retrofit work. When you’re updating panels or replacing aging components, this bolt‑on, two‑pole breaker delivers precise protection where it matters most.