LGB3B125B - 125Amp Circuit Breaker

LGB3B125B - 125Amp Circuit Breaker

Matching an LGB3B125B in your existing panelboard is about more than finding another breaker marked 125 amps. This 125A, 3-pole LGB G-frame circuit breaker is designed for compatible low-voltage panelboard applications and incorporates a thermal-magnetic trip unit. Its interrupting ratings are 65 kA at 480Y/277V and 14 kA at 600Y/347V. Those are important numbers to verify, but the physical and connection details deserve equal attention. The panelboard application should correspond with the LGB frame, three-pole arrangement, terminal configuration, conductor range, and breaker dimensions. When servicing existing or legacy electrical equipment, checking the complete LGB3B125B specification set helps establish whether the breaker provides the required form, fit, and function.

Key Features and Benefits

• 125A, 3-pole configuration for compatible low-voltage panelboard applications
• LGB G-frame construction provides an important frame reference when matching existing electrical equipment
• Thermal-magnetic trip unit provides the specified overload and short-circuit protection
• UL Listed LGB frame
• Uses TC1GG20 load-side lugs only
• Accepts 8–1/0 AWG copper or aluminum (Cu/Al) conductors
• Useful for maintenance and functional replacement where the existing equipment requires the specific LGB3B125B configuration

Technical Specifications

• Catalog Number: LGB3B125B
  
• Article Number: US2\:LGB3B125B
  
• Product Type: Low-Voltage Panelboard-Mount Circuit Breaker
  
• Frame: LGB / G Frame
  
• Ampere Rating: 125A
  
• Number of Poles: 3
  
• Trip Type: Thermal-Magnetic
  
• Interrupting Rating at 480Y/277V: 65 kA
  
• Interrupting Rating at 600Y/347V: 14 kA
  
• Terminal Arrangement: Load-Side Lugs Only
  
• Load Lug Type: TC1GG20
  
• Wire Range: 8–1/0 AWG
  
• Conductor Compatibility: Copper / Aluminum (Cu/Al)
  
• Dimensions: 3"W x 5.4"H x 2.8"D
  
• Net Weight: 2.756 lb
  
• Country of Origin: Mexico
  
• UPC: 887621220358
  
• Commodity Code: 8536200020
  
• Export Classification: ECCN EAR99 / AL N
  
• Dangerous Goods: No
  

Material Compliance and Certifications

Manufacturer specifications identify the LGB frame as UL Listed. The environmental information supplied for the LGB3B125B also references WEEE (2012/19/EU) take-back obligations and provides information associated with REACH Article 33.

Where It Works Best

The LGB3B125B 125A 3-pole circuit breaker is intended for existing and legacy low-voltage panelboards that require this particular LGB G-frame configuration. It's a useful option when you need to preserve the specified electrical and physical characteristics of an existing breaker position.

Compatibility starts with the obvious details: 125 amps and three poles. Then go further. The application should require an LGB G-frame breaker with a thermal-magnetic trip unit, and the electrical system requirements need to align with the breaker's 65 kA interrupting rating at 480Y/277V and 14 kA interrupting rating at 600Y/347V.