LGB3B040B - 40Amp Circuit Breaker

LGB3B040B - 40Amp Circuit Breaker

For replacement work in an existing panelboard, small specification differences can determine whether your breaker fits the application. The LGB3B040B is a 40A, 3-pole LGB G-frame circuit breaker designed for compatible low-voltage panelboards. It uses a thermal-magnetic trip unit and carries interrupting ratings of 65 kA at 480Y/277V and 14 kA at 600Y/347V. That's a useful starting point when identifying the breaker. From there, check the details that determine compatibility: three poles, LGB G-frame construction, terminal arrangement, conductor range, and physical size. Reviewing the full specification set is especially useful when maintaining legacy equipment, where form, fit, and function must match the existing installation.

Key Features and Benefits

• 40A, 3-pole configuration for compatible low-voltage panelboard applications
• LGB G-frame design provides an important identification point when matching breakers to existing equipment
• Thermal-magnetic trip unit provides the specified overload and short-circuit protection
• UL Listed LGB frame
• Equipped with TC1GG20 load-side lugs only
• Accommodates 8–1/0 AWG copper or aluminum (Cu/Al) conductors
• Useful for maintenance and functional replacement when the panelboard requires the specific LGB3B040B configuration

Technical Specifications

• Catalog Number: LGB3B040B
  
• Article Number: US2\:LGB3B040B
  
• Product Type: Low-Voltage Panelboard-Mount Circuit Breaker
  
• Frame: LGB / G Frame
  
• Ampere Rating: 40A
  
• 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: 887621220266
  
• Commodity Code: 8536200020
  
• Export Classification: ECCN EAR99 / AL N
  
• Dangerous Goods: No
  

Material Compliance and Certifications

The manufacturer-supplied specifications identify the LGB frame as UL Listed. Environmental information for the LGB3B040B also references WEEE (2012/19/EU) take-back obligations and includes information associated with REACH Article 33.

Where It Works Best

The LGB3B040B 40A 3-pole circuit breaker is best suited to existing and legacy low-voltage panelboards that are designed around this particular LGB G-frame configuration. This is the kind of application where matching one or two specifications isn't enough. The complete breaker configuration matters.