SIEMENS NGB3B125BNAV Molded Case Circuit Breaker

The SIEMENS NGB3B125BNAV is a 3-pole molded case circuit breaker designed for panelboard mounting, suitable for electrical distribution and protection applications. It is intended for use exclusively in Siemens panelboard and switchboard designs, providing reliable overcurrent protection in commercial and industrial electrical systems. This breaker is compatible with Siemens certified components and supports wire and cable connections with copper and aluminum conductors.

Specifications

• Manufacturer: Siemens
• Manufacturer Part Number: NGB3B125BNAV
• Number of Poles: 3
• Continuous Current Rating: 125 Amperes @ 40¬∞C
• Voltage Rating: 480Y Volts AC
• Interrupting Rating: 25 kA RMS symmetrical amperes
• Mounting Type: Panelboard Mount
• Product Weight: 5.0270 lbs (approx. 2.28 kg)
• Wire Size Compatibility:
  • 15-30A: #14‚Äì#6 AWG Cu, #12‚Äì#6 AWG Al
  • 35-125A: #8‚Äì1/0 AWG Cu, #8‚Äì2/0 AWG Al
• Terminal Type: Line and load lugs included as standard
• Torque for Wire Connection:
  • 14-10 AWG Cu/Al: 35 lb. in. (4.0 N¬∑m)
  • 8 AWG Cu/Al: 40 lb. in. (4.5 N¬∑m)
  • 6-4 AWG Cu/Al: 45 lb. in. (5.1 N¬∑m)
  • 3-2/0 AWG Cu/Al: 55 lb. in. (6.2 N¬∑m)
• Dimensions (approximate): Width 3.00 in, Depth 3.00 in, Height 5.50 in
• UPC: 040892165227

Features

• Thermal-magnetic trip unit providing reliable overcurrent protection
• HACR rated for use with heating, air conditioning, and refrigeration equipment
• Load and line lugs included for easy installation with copper or aluminum wire
• Compatible with Siemens accessories such as nut keeper kits for secure wire termination
• Designed for panelboard and switchboard integration ensuring system compatibility
• Compact size suitable for space-efficient electrical distribution systems
• Includes insulating material requirements for mounting on metal surfaces to ensure dielectric strength

Downloads & Links

• Spec Sheet
• Spec Sheet