NEB2B045B - 45 Amp Circuit Breaker

NEB2B045B - 45 Amp Circuit Breaker

Elevate the safety and reliability of your electrical system with the Siemens NEB2B045B. This two‑pole, 45‑amp circuit breaker is designed for low‑voltage panelboard installations and engineered to deliver dependable overload and short‑circuit protection. Its thermal‑magnetic trip unit combines thermal and magnetic protection to respond quickly to faults, giving you peace of mind that your wiring and equipment remain protected. With a compact design and versatile wiring options, the NEB2B045B fits neatly into residential or commercial panelboards without wasting space.

Key Features and Benefits

• Thermal‑Magnetic Trip Unit: Provides dependable protection by reacting to both long-term overloads (thermal) and sudden short circuits (magnetic).
• High Breaking Capacity: Rated at 22 kAIC at 600Y/347 V and 35 kAIC at 480 V, making it suitable for heavier loads and a wider range of applications than typical breakers.
• Flexible Wiring with Load‑Side Lugs: Supports 8 to 1/0 AWG copper or aluminum wire, offering flexibility when wiring different panel configurations.
• Compact EG‑Frame Design: The modest 2″ × 5.5″ × 3″ footprint makes mounting simpler and allows for efficient use of panelboard space, while keeping installation lightweight (approx. 1.257 lb).

Technical Specifications

• Frame Type: EG frame
  
• Trip Unit: Thermal‑Magnetic
  
• Poles: Two‑pole
  
• Current Rating: 45 A
  
• Voltage Ratings / Breaking Capacity:
  • 600Y/347 V — 22 kAIC
  • 480 V — 35 kAIC
• Wire Range (CU/AL): 8–1/0 AWG
  
• Dimensions:
  • Width: 2 inches
  • Height: 5.5 inches
  • Depth: 3 inches
• Weight: 1.257 lb
  

Material Compliance and Certifications

• UL Listed: The Siemens NEB2B045B circuit breaker is UL Listed, confirming that it meets rigorous safety and performance standards for over‑current protection devices. This certification ensures compliance with North American electrical safety codes and gives you confidence that the breaker has passed rigorous testing for safe, reliable operation under normal and fault conditions.

Where It Works Best

• This breaker is ideal for a broad range of residential and commercial electrical systems where dependable overload and short‑circuit protection is essential. It’s a great match for main or sub‑panel installations in homes, small businesses, retail spaces, and light‑industrial settings. Its high breaking capacity and flexible wiring options make it particularly useful for moderate‑duty HVAC circuits, lighting loads, and general equipment feeds — or in any application where safety and reliability come first.