SIEMENS NGB3B045BNAV Molded Case Circuit Breaker

The Siemens NGB3B045BNAV is a 3-pole molded case circuit breaker designed for panelboard and switchboard applications. It provides reliable protection for electrical distribution systems by interrupting overcurrent faults. This breaker is suitable for use in commercial and industrial electrical distributor environments, offering robust performance for lighting solutions, wire and cable protection, and as part of switchgear assemblies.

Specifications

• Manufacturer: Siemens
• Manufacturer Part #: NGB3B045BNAV
• Number of Poles: 3
• Continuous Current Rating: 45 Amperes @ 40¬∞C
• Interrupting Rating: 25 kA at 480Y/277V AC (UL 489)
• Voltage Rating: 480Y/277V AC
• Mounting Type: Panelboard Mount (NGB Frame)
• Product Weight: 5.027 lbs (approx. 2.28 kg)
• Wire Size Compatibility: #14‚Äì#6 AWG Copper, #12‚Äì#6 AWG Aluminum for 15‚Äì30A; #8‚Äì1/0 AWG Copper, #8‚Äì2/0 AWG Aluminum for 35‚Äì125A

Features

• Thermal-magnetic trip unit providing standard overcurrent protection
• Load and line lugs included for standard copper/aluminum wire termination
• HACR rated for use with heating, air conditioning, and refrigeration equipment
• Panelboard and switchboard compatibility with Siemens certified components
• Compact 1-inch width per pole for space-efficient installations
• Designed for use with Siemens NGB panelboard mount systems
• Includes nut keeper kit (TNKG3) for secure wire termination (optional accessory)
• Installation instructions emphasize safety measures including power lockout and insulation requirements

Downloads & Links

• Spec Sheet
• Spec Sheet