NGB2B040B - 40 Amp Circuit Breaker

NGB2B040B - 40 Amp Circuit Breaker

Give your electrical system the dependable protection it deserves with the Siemens NGB2B040B 40 Amp two-pole circuit breaker. This panelboard-mounted, low-voltage G-Frame breaker delivers dependable overload and short‑circuit protection, so you can feel confident about the safety and continuity of your power distribution — whether you’re wiring a light commercial setup or a heavier industrial panel. Compact yet powerful, it’s built to handle demanding environments while remaining easy to install and maintain.

Key Features and Benefits

• Thermal‑Magnetic Trip Unit: Delivers dual protection against both overloads and short circuits, helping prevent circuit damage and reducing downtime.
• High Interrupting Capacity: Rated at 14 kAIC at 600Y/347V and 25 kAIC at 480Y/277V for strong interruption capability and enhanced safety under fault conditions.
• Two-Pole, 40 Amp Capacity: Provides stable performance for mid-range loads while fitting well in standard panelboards.
• Simplified Installation: Load-side lugs only (TC1GG20) make for straightforward wiring and secure connections, saving time during panel builds or upgrades.

Technical Specifications

• Current Rating: 40 A
  
• Poles: 2 (Two-pole)
  
• Breaking Capacity:
  • 14 kAIC at 600Y/347V
  • 25 kAIC at 480Y/277V
• Dimensions:
  • 2.0" W
  • 5.4" H
  • 2.8" D
• Wire Range (CU/AL): 8 – 1/0 AWG
  
• Weight: 1.889 lb
  

Material Compliance and Certifications

• UL Listed: Meets rigorous safety and performance standards to give you confidence in code compliance and long-term dependability.
• RoHS Compliant: Manufactured to limit hazardous substances, reflecting a commitment to environmental responsibility.
• WEEE Take-Back Compliant: Supports environmentally responsible disposal and recycling when the unit reaches end of life.

Where It Works Best

• This circuit breaker is ideal for installation in commercial and industrial panelboards — anywhere you need a reliable, easy-to-integrate solution for mid-range circuits. Use it to protect branch circuits in offices, retail spaces, light manufacturing, or other power-distribution applications. Its compact design and high interrupting capacity make it especially well suited for systems that require dependable protection under heavy load or variable fault conditions.