NEB2B125B - 125 Amp Circuit Breaker

NEB2B125B - 125 Amp Circuit Breaker

Meet the Siemens NEB2B125B, a reliable low-voltage panelboard circuit breaker engineered for commercial and industrial electrical systems. Designed to deliver dependable overcurrent protection, this two-pole unit features a thermal‑magnetic trip mechanism that responds quickly to overloads and short circuits. With a 125 A rating and a compact form factor, the NEB2B125B offers dependable fault interruption and long-term performance for diverse applications — from light commercial to heavy industrial.

Key Features and Benefits

• Thermal‑Magnetic Trip Unit: Precisely senses overloads and short circuits, ensuring your wiring and equipment remain protected when conditions exceed safe limits.
• High Interrupting Capacity: Handles high‑fault conditions effortlessly — up to 22 kAIC at 600Y/347 V or 35 kAIC at 480 V — giving you confidence in its ability to interrupt heavy fault currents safely.
• Secure Load Connection: Includes load-side lugs (TA1EG10) that accommodate 8 – 1/0 AWG (CU/AL) wire, delivering stable, secure connections for your circuits.
• Compact Panelboard Fit: The EG‑frame design and small footprint make installation easier in standard low‑voltage panels, saving space while maintaining performance.

Technical Specifications

• Amperage Rating: 125 A
  
• Poles: 2‑Pole
  
• Voltage Rating: 600Y/347 V and 480 V
  
• Interrupting Capacity:
  • 22 kAIC @ 600Y/347 V
  • 35 kAIC @ 480 V
• Trip Type: Thermal‑Magnetic
  
• Frame Type: EG
  
• Load Wire Range: 8 – 1/0 AWG (CU/AL)
  
• Dimensions:
  • Width: 2″
  • Height: 5.5″
  • Depth: 3″
• Weight: 1.962 lb
  

Material Compliance and Certifications

• Safety Standards: This circuit breaker conforms to stringent safety standards, carrying UL listing for electrical protection devices.
• Environmental Compliance: Its construction adheres to environmental regulations, offering compliance with directives such as WEEE (2012/19/EU) for responsible eventual disposal.
• Trusted Quality: You can trust this breaker’s build quality and safety compliance for both commercial and industrial installations.

Where It Works Best

• The NEB2B125B shines in low-voltage panelboard applications across commercial buildings, factories, and light industrial facilities. It is ideal for protecting branch circuits feeding motors, HVAC systems, lighting panels, or general distribution in offices and production floors. If you need a dependable, efficient two‑pole circuit breaker capable of handling moderate to heavy loads — while delivering consistent protection and ease of installation — this model is a smart choice.