LGB1B125B - 125Amp Circuit Breaker

LGB1B125B - 125Amp Circuit Breaker

Need to match a 125A breaker in an existing low-voltage panelboard? The LGB1B125B is a 1-pole LGB G-frame circuit breaker with a thermal-magnetic trip unit. Its interrupting ratings are 65 kA at 277V and 14 kA at 347V. Those specifications help you narrow the search quickly, but amperage alone doesn't determine compatibility. With an existing panel, the breaker frame, pole count, trip type, lug configuration, conductor range, and physical dimensions all deserve a close look.

Key Features and Benefits

• 125A, 1-pole configuration for compatible low-voltage panelboard applications
• LGB G-frame design provides a specific frame reference when identifying a replacement
• Thermal-magnetic trip unit provides the specified overload and short-circuit protection
• UL Listed LGB frame
• Equipped with TC1GG20 load-side lugs only
• Accepts 8–1/0 AWG copper or aluminum conductors
• Well suited to maintenance situations where the existing breaker configuration needs to be retained

Technical Specifications

• Catalog Number: LGB1B125B
  
• Article Number: US2\:LGB1B125B
  
• Product Type: Low-Voltage Panelboard-Mount Circuit Breaker
  
• Frame: LGB / G Frame
  
• Ampere Rating: 125A
  
• Number of Poles: 1
  
• Trip Type: Thermal-Magnetic
  
• Interrupting Rating at 277V: 65 kA
  
• Interrupting Rating at 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: 1"W x 5.4"H x 2.8"D
  
• Net Weight: 0.86 lb
  
• Country of Origin: Mexico
  
• UPC: 887621220051
  
• 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 documentation for the LGB1B125B also references WEEE (2012/19/EU) take-back obligations and includes information associated with REACH Article 33.

Where It Works Best

The LGB1B125B 125A circuit breaker is most relevant for existing and legacy low-voltage panelboards that require this LGB G-frame configuration; in that setting, getting the details right matters more than finding a breaker with a similar-looking case or matching amperage.