NGB2B045B - 45 Amp Circuit Breaker

NGB2B045B - 45 Amp Circuit Breaker

The Siemens NGB2B045B 45 Amp Circuit Breaker delivers reliable electrical protection in a compact form factor — ideal when safety and performance are nonnegotiable. With its thermal‑magnetic trip unit and sturdy 2‑pole design, it guards against overloads and short circuits in demanding low‑voltage panelboard installations. Its high interrupting capacity and flexible wiring compatibility make it a go-to option for commercial and industrial environments where dependable circuit protection counts.

Key Features and Benefits

• Thermal‑Magnetic Trip Unit: Automatically disconnects power under overload or short‑circuit conditions, helping safeguard wiring and connected equipment.
• 2‑Pole, 45 Amp Capacity: Supports multiphase circuits and accommodates heavier loads than a single‑pole breaker would.
• Flexible Wiring Compatibility: Accepts copper or aluminum wire from 8 to 1/0 AWG (CU/AL) via TC1GG20 load-side lugs, simplifying installation and retrofit work.
• High Interrupting Capacity: Rated for 14 kAIC at 600Y/347 V and 25 kAIC at 480Y/277 V, providing confidence in handling potential short‑circuit currents in commercial or industrial electrical systems.
• Compact and Durable: Built to fit standard low‑voltage panelboards, the breaker brings long-term service with minimal upkeep, even in demanding settings.

Technical Specifications

• Amperage: 45 A
• Poles: 2
• Voltage Ratings: 600Y/347 V; 480Y/277 V
• Interrupting Capacity:
  • 14 kAIC @ 600Y/347 V
  • 25 kAIC @ 480Y/277 V
• Load-Side Lug Type: TC1GG20, accepts 8 – 1/0 AWG (CU/AL)
• Mounting: Low-voltage panelboard compatible
• Approximate Dimensions:
  • Width: 2.0 inches
  • Height: 5.4 inches
  • Depth: 2.8 inches

Material Compliance and Certifications

• UL Listed: Meets U.S. safety standards for circuit breakers used in commercial and industrial electrical systems.
• RoHS Compliant: Free from hazardous substances, adhering to environmental and material-safety standards.
• Manufactured in Mexico: Produced under strict quality-control standards to ensure consistent performance and reliability.

Where It Works Best

• This breaker shines when used in commercial buildings, data centers, light-industrial facilities, or any low-voltage panelboard installation that demands consistent, fail-safe protection. Its compact size and 2‑pole design make it especially useful when space is limited or when upgrading older wiring systems. If you’re wiring multiphase equipment or need dependable circuit protection for heavier loads, the Siemens NGB2B045B is a smart fit for new builds, retrofits, or upgrades to existing electrical distribution panels.