NGB3B040B - 40 Amp Circuit Breaker

NGB3B040B - 40 Amp Circuit Breaker

When you need dependable protection for your electrical system, the Siemens NGB3B040B offers a straightforward yet powerful solution. Designed as a low-voltage panelboard‑mount circuit breaker, it delivers dependable overload and short‑circuit protection for commercial and industrial wiring systems. The NGB3B040B brings precise operation under a variety of load conditions, ensuring your equipment and wiring stay safeguarded — whether you’re installing a new panel or upgrading an existing one. With its thermal‑magnetic trip unit and generous breaking capacity, this breaker proves itself an efficient and trustworthy choice for managing electrical loads.

Key Features and Benefits

• Thermal‑Magnetic Trip Unit: Combines thermal (overload) and magnetic (short‑circuit) protection to react quickly and accurately whenever fault conditions arise.
• High Breaking Capacity: Rated at 14 kAIC for 600Y/347V and 25 kAIC for 480Y/277V, this breaker can handle significant fault currents, reducing the risk of damage to connected equipment.
• Load-Side Lugs Only (TC1GG20): Simplifies installation by allowing direct connection to wiring via load‑side lugs.
• Compact Dimensions: At roughly 3″ wide, 5.4″ high, and 2.8″ deep, the NGB3B040B fits neatly into panelboards without wasting space.
  

Technical Specifications

• Rated Current: 40 Amperes
  
• Poles: 3-pole
  
• Voltage Rating: 600Y/347V AC and 480Y/277V AC
  
• Breaking Capacity:
  • 14 kAIC @ 600Y/347V
  • 25 kAIC @ 480Y/277V
• Trip Unit Type: Thermal‑Magnetic
  
• Dimensions:
  • Width: 3.0 inches
  • Height: 5.4 inches
  • Depth: 2.8 inches
• Weight: 2.615 lbs
  
• Lug Type: Load‑side lugs only (TC1GG20)
  
• Wire Range: 8 AWG – 1/0 AWG (CU/AL)
  

Material Compliance and Certifications

• UL Listed: Meets North American safety and performance standards for low‑voltage circuit breakers.
• RoHS Compliant: Constructed without hazardous substances subject to European environmental restrictions.
• WEEE / REACH Compliance: Designed with responsible end‑of‑life standards and chemical regulation compliance in mind, ensuring minimal environmental impact.
  

Where It Works Best

• The NGB3B040B is an excellent fit for low‑voltage panelboard systems in commercial buildings, light industrial facilities, institutional environments, and other settings where dependable electrical protection is critical. Whether you're outfitting a new distribution panel or upgrading an existing setup, this breaker provides reliable protection against overcurrents and short circuits — helping maintain continuous, safe operation of critical electrical systems.