NEB2B040B - 40 Amp Circuit Breaker

NEB2B040B - 40 Amp Circuit Breaker

Meet the Siemens NEB2B040B, a dependable and efficient dual‐pole circuit breaker engineered for low‑voltage panelboard applications in commercial and industrial environments. Rated for 40 amps, this unit delivers strong overcurrent protection through its thermal‑magnetic trip mechanism — safeguarding your electrical setup from overloads and short circuits. With a high interrupting capacity (22 kAIC at 600Y/347 V and 35 kAIC at 480 V), it’s built to handle heavy-duty loads. Whether you're installing a new electrical panel or upgrading an existing one, the NEB2B040B delivers solid performance and reliability.

Key Features and Benefits

• Thermal‑Magnetic Trip Unit: Offers accurate overcurrent detection and quick response to overloads or short circuits, giving you peace of mind that your circuit is protected.
• High Interrupting Capacity: With 22 kAIC at 600Y/347 V and 35 kAIC at 480 V, this breaker can guard circuits even under serious fault conditions, keeping your electrical system safe and operational.
• Dual‑Pole 40 A Rating: Perfect for 240 V or equivalent multi-phase circuits needing reliable two-pole protection.
• Wide Wire Compatibility and Secure Connections: Equipped with load‑side lugs (TA1EG10), supporting 8 – 1/0 AWG copper or aluminum wiring for flexible installation options.
• Compact, Installer-Friendly Design: Sized at approximately 2" wide, 5.5" tall, and 3" deep, it fits neatly into most standard low‑voltage panels without wasting space.

Technical Specifications

• Amperage Rating: 40 A
  
• Voltage Rating: 600Y/347 V and 480 V
  
• Interrupting Capacity:
  • 22 kAIC @ 600Y/347 V
  • 35 kAIC @ 480 V
• Trip Mechanism: Thermal‑Magnetic
  
• Frame Type: EG
  
• Dimensions:
  • Width: 2 inches
  • Height: 5.5 inches
  • Depth: 3 inches
• Weight: Approx. 1.85 lb
  
• Wire Range (CU/AL): 8 – 1/0 AWG (via load-side lugs)
  

Material Compliance and Certifications

• UL Listed: This Siemens breaker is built to meet the highest industry safety standards. It is UL-listed, confirming compliance with rigorous North American electrical protection requirements.
• WEEE Compliance: Adheres to the WEEE (2012/19/EU) Take-Back standard — reflecting a commitment to environmentally responsible manufacturing and disposal practices.

Where It Works Best

• The NEB2B040B shines in commercial and industrial low‑voltage panelboard installations — especially where dependable overcurrent protection and high interrupting capacity are essential. It’s ideal for manufacturing facilities, warehouses, HVAC units, and large electrical loads that demand a heavy-duty two‑pole breaker. For electricians and facility managers seeking a reliable, code-compliant circuit breaker that blends performance with simplicity, this unit is a smart, long-lasting choice.