LGB2B125B - 125Amp Circuit Breaker

LGB2B125B - 125Amp Circuit Breaker

When an existing panelboard calls for the LGB2B125B, the details matter. This 125A, 2-pole LGB G-frame circuit breaker is designed for compatible low-voltage panelboard applications. It uses a thermal-magnetic trip unit and carries interrupting ratings of 65 kA at 480Y/277V and 14 kA at 600Y/347V. That gives you several useful checkpoints right away. Still, a correct breaker match involves more than finding the same amp rating. Frame size, number of poles, trip type, terminal configuration, conductor range, and physical dimensions should all correspond with the equipment requirements.

Key Features and Benefits

• 125A, 2-pole configuration for compatible low-voltage panelboards
• LGB G-frame design provides an important reference when matching breakers in existing electrical equipment
• Thermal-magnetic trip unit provides the specified overload and short-circuit protection
• UL Listed LGB frame
• Fitted with TC1GG20 load-side lugs only
• Accepts 8–1/0 AWG copper or aluminum conductors
• Practical for maintenance and functional replacement applications requiring this specific LGB breaker configuration

Technical Specifications

• Catalog Number: LGB2B125B
  
• Article Number: US2\:LGB2B125B
  
• Product Type: Low-Voltage Panelboard-Mount Circuit Breaker
  
• Frame: LGB / G Frame
  
• Ampere Rating: 125A
  
• Number of Poles: 2
  
• 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: 2"W x 5.4"H x 2.8"D
  
• Net Weight: 1.852 lb
  
• Country of Origin: Mexico
  
• UPC: 887621220204
  
• Commodity Code: 8536200020
  
• Export Classification: ECCN EAR99 / AL N
  
• Dangerous Goods: No
  

Material Compliance and Certifications

The supplied manufacturer specifications identify the LGB frame as UL Listed. Environmental information for the LGB2B125B also references WEEE (2012/19/EU) take-back obligations and includes information associated with REACH Article 33.

Where It Works Best

The LGB2B125B 125A 2-pole circuit breaker is intended for situations where an existing or legacy low-voltage panelboard requires this particular LGB G-frame arrangement. In replacement work, getting the catalog number right is useful. Confirming why it's right is even better.

When those details match the panelboard requirements—from 125 amps and two poles to the frame, trip type, interrupting ratings, lugs, conductor range, and dimensions—the LGB2B125B can be evaluated as the correct form, fit, and functional replacement.