LGB2B040B - 40Amp Circuit Breaker

LGB2B040B - 40Amp Circuit Breaker

When you're matching a breaker for an existing panelboard, the catalog number can save a lot of guesswork. The LGB2B040B is a 40A, 2-pole LGB G-frame circuit breaker with a thermal-magnetic trip unit. Its documented interrupting ratings are 65 kA at 480Y/277V and 14 kA at 600Y/347V. Those are key electrical specifications, but they're only part of the compatibility check. The LGB frame, two-pole arrangement, terminal configuration, conductor size, and breaker dimensions should also match the equipment.

Key Features and Benefits

• 40A, 2-pole configuration for compatible low-voltage panelboard applications
• LGB G-frame design gives technicians a specific frame configuration to verify against 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 conductors

Technical Specifications

• Catalog Number: LGB2B040B
  
• Article Number: US2\:LGB2B040B
  
• Product Type: Low-Voltage Panelboard-Mount Circuit Breaker
  
• Frame: LGB / G Frame
  
• Ampere Rating: 40A
  
• 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: 887621220112
  
• 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 LGB2B040B also references WEEE (2012/19/EU) take-back obligations and includes information associated with REACH Article 33.

Where It Works Best

The LGB2B040B 40A 2-pole circuit breaker is most relevant when maintaining existing and legacy low-voltage panelboards that require this particular LGB G-frame breaker configuration. In these applications, a close match matters. Two breakers can share an amp rating while differing in pole count, terminals, conductor range, dimensions, or interrupting ratings.