NGB1B040B - 40 Amp Circuit Breaker

NGB1B040B - 40 Amp Circuit Breaker

The Siemens NGB1B040B is a 40-amp single‑pole circuit breaker engineered to deliver dependable protection and smooth performance for commercial and industrial electrical systems. Built to meet UL 489 safety standards and rated for a maximum of 347 V AC, this breaker provides stable, predictable power control for lighting, heating, motor circuits, and more. Its compact design makes it easy to install into most panelboards and switchboards, while the included load lugs simplify wiring—so you spend less time on installation and more time on the job. Whether you're upgrading an existing panel or building a new electrical distribution setup, the NGB1B040B brings you a high-quality solution you can rely on day after day.

Key Features and Benefits

• High Interrupting Capacity: Handles up to 25 kA at 277 V and 14 kA at 347 V — so it can safely interrupt fault currents and protect downstream devices.
• Durable Construction: Built to resist wear and tear even in demanding environments, ensuring long‑lasting performance under load.
• Easy Installation: Load lugs are included, making wiring straightforward and reducing installation time and complexity.
• Space‑Saving Design: Single-pole format and slim profile help you maximize room in panelboards or switchboards without sacrificing safety or capacity.

Technical Specifications

• Rated Current: 40 A
• Maximum Voltage: 347 V AC
• Interrupting Capacity:
  • 25 kA @ 277 V
  • 14 kA @ 347 V
• Number of Poles: 1
• Weight: 0.880 lb

Material Compliance and Certifications

• RoHS Compliance: Ensures the product is free from hazardous substances.
• WEEE Directive: Reflects a commitment to environmental responsibility and sustainable product lifecycle management.

Where It Works Best

• This circuit breaker is ideal for commercial offices, industrial plants, retail buildings, and light-to-medium industrial applications. Use it for lighting circuits, general branch circuits, heating loads, or motor‑protections—especially where reliable power control and safety are critical. It’s a solid choice for facility managers, electrical contractors, or maintenance teams who want dependable circuit protection in a compact, easy-to-install package.