TJK426125 **Older Style** - 125Amp Circuit Breaker

TJK426125 **Older Style** - 125 Amp Circuit Breaker

The TJK426125 molded case circuit breaker is designed for dependable circuit protection in your commercial and industrial electrical distribution systems that require a 2-pole, 125-amp configuration. Built as part of the trusted Q-Line family, this bolt-on breaker features an older-style black-face design. It is commonly used in existing panelboard and switchgear applications where proper fit and compatibility matter. Its thermal magnetic trip unit provides both overload and short-circuit protection, while the internal common trip mechanism helps ensure both poles disconnect simultaneously during fault conditions. With included load-side lugs and a non-interchangeable trip unit, the TJK426125 is well-suited for maintaining or servicing legacy electrical systems that depend on this exact breaker style and rating combination. Designed for long-term durability and consistent operation, this breaker is HACR-rated and built to withstand demanding electrical environments where reliable protection is essential.

Key Features and Benefits

• 125 Amp, 2-pole molded case circuit breaker: For commercial and industrial power distribution systems.
• Older style black face configuration: For compatibility with existing installations.
• Thermal magnetic trip unit: Helps protect against overloads and short circuits.
• Internal common trip design: Disconnects both poles simultaneously during fault events.
• Bolt-on mounting style: Supports secure installation in compatible equipment.
• Includes load-side lugs: Adds installation convenience.
• HACR rated: Approved for heating, air conditioning, and refrigeration applications.
• Q-Line series breaker: Designed for dependable operation in legacy electrical systems.
• Non-interchangeable trip unit: Helps maintain consistent protection settings.
• Built for long service life: Suitable for demanding electrical environments.
  

Technical Specifications

• Part Number: TJK426125
  
• Series: Q-Line
  
• Type: TJK4
  
• Circuit Breaker Style: Older Style Black Face
  
• Poles: 2
  
• Amperage Rating: 125 Amps
  
• Voltage / A.I.C. Ratings: 22k @ 600VAC; 30k @ 480VAC; 42k @ 240VAC
  
• Trip Unit: Thermal Magnetic
  
• Trip Style: Internal Common Trip
  
• Mounting Type: Bolt-On
  
• Lugs: Includes Load-Side Lugs
  
• HACR Rated: Yes
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: Approved for HVAC and refrigeration system applications.
• Commercial and Industrial Use: Manufactured for use in commercial and industrial electrical distribution equipment.
• Molded Case Circuit Breaker Standards: Designed to meet applicable standards for its class and configuration.
• Dependable Overcurrent Protection: Suitable for installations requiring legacy equipment compatibility and reliable protection.
  

Where It Works Best

• The TJK426125 circuit breaker is commonly used in commercial buildings, industrial facilities, manufacturing plants, and HVAC-related electrical systems requiring a 125-amp, 2-pole breaker with bolt-on mounting. It is especially useful for replacement and maintenance projects involving existing Q-Line electrical distribution equipment where matching dimensions, connection style, and electrical ratings are important. This breaker is a practical solution for panelboards and switchgear applications that rely on older-style black-face TJK4 breakers for proper form, fit, and function.