HGB3B125B - 125Amp Circuit Breaker

HGB3B125B - 125Amp Circuit Breaker

The HGB3B125B is a 125-amp, 3-pole HGB G-frame circuit breaker built for compatible low-voltage panelboard applications where dependable overload and short-circuit protection are essential. Its compact dimensions—approximately 3 inches wide by 5.4 inches high by 2.8 inches deep—also make physical verification simple when you're matching an existing panelboard installation. For applications calling specifically for an HGB3B125B 125A 3-pole circuit breaker, the combination of HGB frame construction, thermal-magnetic protection, defined interrupting ratings, and Cu/Al conductor compatibility gives you the key specifications needed to evaluate the fit with confidence.

Key Features and Benefits

• 125A current rating: Designed for circuits and compatible panelboard applications requiring a 125-amp breaker.
• 3-pole configuration: Provides simultaneous circuit protection across three poles for suitable three-phase electrical systems.
• Thermal-magnetic trip unit: Combines thermal overload response with magnetic short-circuit protection.
• HGB G-frame design: Built for compatible low-voltage panelboard mounting applications using the HGB frame configuration.
• Load-side lug configuration: Equipped with TC1GG20 load-side lugs only, an important detail when matching an existing installation.
• Copper and aluminum conductor compatibility: Accepts 8 AWG to 1/0 AWG Cu/Al conductors, providing flexibility for approved wiring applications.
  

Technical Specifications

• Catalog Number / MFN: HGB3B125B
  
• Product Type: Low-voltage panelboard circuit breaker
  
• Frame Type: HGB G-Frame
  
• Amperage: 125A
  
• Number of Poles: 3
  
• Trip Unit: Thermal-magnetic
  
• Interrupting Rating at 600Y/347V: 14 kAIC
  
• Interrupting Rating at 480Y/277V: 35 kAIC
  
• Lug Configuration: Load-side lugs only
  
• Lug Type: TC1GG20
  
• Wire Range: 8 AWG to 1/0 AWG
  
• Conductor Compatibility: Copper / Aluminum (Cu/Al)
  
• Dimensions (W x H x D): 3 x 5.4 x 2.8 in.
  
• Net Weight: 2.756 lb.
  
• UPC: 887621219901
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The HGB3B125B circuit breaker is UL Listed, providing an important certification reference when evaluating the breaker for a compatible electrical installation. Environmental documentation associated with this model references WEEE (2012/19/EU) take-back obligations and REACH Article 33 information. RoHS substance-restriction compliance is listed as not available in the supplied technical data, and a SCIP number is not provided.

Where It Works Best

The HGB3B125B 125A 3-pole circuit breaker is best suited to compatible low-voltage panelboards and commercial or industrial electrical distribution systems that specifically require an HGB G-frame breaker with this amperage, pole configuration, trip technology, and interrupting capacity. Its thermal-magnetic trip mechanism makes it appropriate where protection against both sustained overload conditions and short circuits is required.