TJJ426125 **Older Style** - 125Amp Circuit Breaker

TJJ426125 **Older Style** - 125 Amp Circuit Breaker

The TJJ426125 molded case circuit breaker is a solid choice for maintaining and servicing your existing commercial and industrial electrical systems that require a compatible Q-Line bolt-on breaker. Built with the recognizable older style black face, this 2-pole, 125-amp breaker is commonly used in panelboards and distribution equipment where matching the original setup matters. Its thermal magnetic trip unit helps you to protect electrical systems from overloads and short circuits, while the internal common trip mechanism disconnects both poles during a fault condition.

Designed for dependable everyday operation, the TJJ426125 includes load-side lugs for easier installation and secure wire connections. The bolt-on mounting style helps keep the breaker firmly in place in compatible equipment, making it a practical fit for maintenance teams, electrical contractors, and facility managers working with existing infrastructure. With interrupting capacities rated up to 22 kA at 600 VAC, this breaker is well-suited for a range of demanding power distribution applications. The HACR rating also allows use in heating, ventilation, air conditioning, and refrigeration systems where properly rated protection devices are required.

Key Features and Benefits

• 125 Amp Current Rating: Designed for commercial and industrial applications requiring dependable overcurrent protection.
• 2-Pole Design: Compatible with multi-phase electrical systems where two-pole protection is required.
• Older Style Black Face: Helps match existing equipment layouts and maintain consistency in legacy systems.
• Thermal Magnetic Trip Unit: Helps protect against overloads and short circuits for reliable electrical system protection.
• Internal Common Trip: Disconnects both poles simultaneously during fault conditions for added system protection.
• Bolt-On Mounting: Provides a secure fit in compatible panelboards and distribution equipment.
• Q-Line Series Compatibility: Designed for form, fit, and functional replacement needs in existing installations.
• Load-Side Lugs Included: Allows for convenient installation and secure wire terminations.
• HACR Rated: Suitable for heating, ventilation, air conditioning, and refrigeration applications.
• Built for Demanding Environments: Constructed for long-lasting service in commercial and industrial electrical systems.
  

Technical Specifications

• Part Number: TJJ426125
  
• Type: TJJ
  
• Product Style: Older Style Black Face
  
• Poles: 2
  
• Amperage: 125A
  
• A.I.C. Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Mounting Style: Bolt-On
  
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Series: Q-Line
  
• HACR Rated: Yes
  
• Included: Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: The TJJ426125 is HACR-rated for use in heating, air conditioning, and refrigeration systems when installed in accordance with applicable electrical codes and equipment requirements.
• Electrical System Compatibility: This breaker is intended for use in properly designed electrical distribution systems requiring correctly rated overcurrent protection.
  

Where It Works Best

• The TJJ426125 is commonly found in commercial buildings, industrial facilities, manufacturing operations, HVAC equipment and distribution systems, electrical panelboards and switchgear, and maintenance and retrofit projects involving legacy Q-Line equipment. For facilities keeping existing electrical systems operating safely and consistently, this breaker provides the form, fit, and function needed for compatible replacement applications.