THJK426125 - 125Amp Circuit Breaker

THJK426125 - 125Amp Circuit Breaker

The THJK426125 Circuit Breaker is a 125-amp, two-pole molded-case breaker in the J600 product line, designed for your compatible commercial and industrial electrical distribution systems. With an interchangeable thermal-magnetic trip configuration and an LI (Long-Time and Instantaneous) trip function, this breaker provides overload and short-circuit protection per its specified trip characteristics. The THJK426125 belongs to the THJK breaker family, which uses interchangeable trip units and is intended for applications where the correct frame, trip assembly, and electrical ratings must match the existing equipment. For facilities maintaining established electrical installations, the THJK426125 offers a clearly identified configuration for form-, fit-, and function replacement.

Key Features and Benefits

• 125-Amp Current Rating
• Two-Pole Circuit Breaker Configuration
• J600 Product Line
• THJK Interchangeable Trip Design
• Thermal-Magnetic Circuit Protection
• LI Trip Function
• 400-Amp Frame Family
• Frame-Specific Trip Compatibility
• Molded Case Construction
• Replacement Configuration Identification
• Form, Fit, and Functional Replacement Considerations

Technical Specifications

• Catalog Number: THJK426125
  
• UPC: 783164000000
  
• Product Type: Molded Case Circuit Breaker
  
• Product Category: Thermal-Magnetic Circuit Breaker
  
• Product Line: J600
  
• Breaker Type: THJK
  
• Rated Current: 125 Amperes (125A)
  
• Number of Poles: 2
  
• Trip Unit Configuration: Interchangeable
  
• Trip Technology: Thermal-Magnetic
  
• Trip Function: LI (Long-Time and Instantaneous)
  
• Long-Time Protection: Thermal Overload Protection
  
• Instantaneous Protection: Magnetic Short-Circuit Protection
  
• Applicable Frame Range: 400A Frame Family, 125A–400A
  
• J600 Product Line Maximum Rating: Up to 600A and 600VAC, depending on configuration
  

Material Compliance and Certifications

The THJK426125 Industrial Molded Case Circuit Breaker features a molded case construction and an interchangeable thermal-magnetic trip configuration. Its published catalog information identifies a 125A current rating, two-pole arrangement, J600 frame family, and LI trip function.

The supplied product information does not fully establish specific material compositions and safety certifications. Evaluate electrical installations requiring specific approvals using the individual device's markings and applicable manufacturer documentation.

Before installation, qualified electrical personnel should confirm the correct frame and trip-unit combination, required safety listings, mounting arrangement, conductor connections, and equipment compatibility.

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
• Commercial and Industrial Electrical Restoration
• Form, Fit, and Functional Replacement Applications