THJK426125WL - 125Amp Circuit Breaker

THJK426125WL - 125Amp  Circuit Breaker

The THJK426125WL Circuit Breaker is a 125-amp, two-pole molded-case breaker designed for your compatible commercial and industrial electrical distribution systems. Part of the J600 product line, this THJK breaker features an interchangeable thermal-magnetic trip unit, LI (Long-Time and Instantaneous) protection, and copper/aluminum-compatible line-side and load-side lugs. For maintenance professionals working with established electrical equipment, the THJK426125WL offers a specific combination of current rating, pole configuration, protective functions, and terminal connections to consider when preserving the original system's form, fit, and function.

Key Features and Benefits

• 125-Amp Current Rating
• Two-Pole Circuit Breaker Configuration
• J600 Molded Case Frame
• Interchangeable Thermal-Magnetic Trip Unit
• LI Trip Protection
• Fixed Long-Time Trip Function
• Adjustable Instantaneous Trip Function
• Cu/Al Line and Load Lugs Included
• Voltage-Specific Interrupting Ratings
• Not Suitable for Reverse Feed
• Defined Replacement Configuration
• Form, Fit, and Functional Replacement Considerations

Technical Specifications

• Catalog Number: THJK426125WL
  
• UPC: 783164046632
  
• Manufacturer: ABB
  
• Manufacturer Description: ASM THJK C/B 2P 125A W/L
  
• Product Type: Molded Case Circuit Breaker
  
• Product Category: Thermal-Magnetic Circuit Breaker
  
• Product Line / Frame Type: J600
  
• Breaker Type: THJK
  
• Rated Current: 125 Amperes (125A)
  
• Number of Poles: 2
  
• Trip Style: Interchangeable
  
• Trip Technology: Thermal-Magnetic
  
• Trip Function: LI (Long-Time and Instantaneous)
  
• Long-Time Trip: Fixed
  
• Instantaneous Trip: Adjustable
  
• Continuous Current Rating Classification: Standard
  
• Applicable Frame Family: 400A Frame, 125A–400A Range
  
• System Voltages Listed: 120VAC, 120/240VAC, 125VDC, 240VAC, 250VDC, 277VAC, 480VAC, and 600VAC
  
• Interrupting rating at 120VAC: 65kAIC
  
• Interrupting rating at 120/240VAC: 65kAIC
  
• Interrupting rating at 125VDC: 40kAIC
  
• Interrupting rating at 240VAC: 65kAIC
  
• Interrupting rating at 250VDC: 40kAIC
  
• Interrupting rating at 277VAC: 35kAIC
  
• Interrupting rating at 480VAC: 35kAIC
  
• Interrupting rating at 600VAC: 25kAIC
  
• Line-Side Lugs: Included
  
• Load-Side Lugs: Included
  
• Lug Compatibility: Copper/Aluminum (Cu/Al)
  
• Lug Designations Listed: TC043, TCAL43, TCAL47
  
• WL Catalog Suffix: Indicates Included Cu/Al Line and Load Lugs
  
• Assembly Description: Assembled THJK Circuit Breaker with Line and Load Lugs
  
• Suitable for Reverse Feed: No
  
• Current Metering: No
  
• Protective Relays: No
  
• GO Schedule: 135LG
  
• GSA Compliance: No
  
• UL File Number: E11592
  
• CSA File Number: LR40350
  
• Overall Dimensions: Not provided in the supplied specifications
  
• Shipping Weight: Not provided in the supplied specifications
  

Material Compliance and Certifications

The THJK426125WL Industrial Molded Case Circuit Breaker features molded case construction, an interchangeable thermal-magnetic trip configuration, and included copper/aluminum-compatible line and load lugs.

The manufacturer's specifications also list UL File E11592 and CSA File LR40350, providing specific references to evaluate the product's documented safety certifications.

These file references help confirm whether the breaker is appropriate for a particular electrical installation. However, a file number alone does not establish every condition of acceptability, equipment compatibility requirement, or installation approval.

Where It Works Best

• Existing Commercial Electrical Systems
• Industrial Power Distribution Equipment
• Two-Pole Electrical Applications
• 125-Amp Circuit Protection
• Legacy Electrical Distribution Systems
• Matching THJK Circuit Breaker Replacements
• Industrial Machinery and Equipment Protection
• Facility Maintenance and Electrical Repairs
• 400-Amp J600 Frame Applications
• Interchangeable Trip Unit Applications
• Installations Requiring Line and Load Lugs
• 480VAC Electrical Distribution Systems
• 600VAC Electrical Distribution Systems
• Compatible DC Electrical Systems
• Commercial and Industrial Electrical Restoration
• Form, Fit, and Functional Replacement Applications