TJK426300 - 300Amp Circuit Breaker

TJK426300 - 300 Amp Circuit Breaker

The TJK426300 molded case circuit breaker is designed for you to use in commercial and industrial electrical distribution systems requiring dependable overcurrent protection in a compact bolt-on configuration. Built as part of the Q-Line series, this 2-pole, 300-amp breaker features a thermal magnetic trip unit with internal common trip, helping you to protect connected equipment and branch circuits from overloads and short circuits. Its non-interchangeable trip design supports consistent operation in applications where fixed protection settings are required.

With interrupting capacities rated up to 22kA at 600VAC, 30kA at 480VAC, and 42kA at 240VAC, the TJK426300 is commonly used in panelboards, switchboards, motor control systems, and HVAC equipment where reliable circuit protection is essential. The included load-side lugs simplify installation, while the bolt-on mounting style provides a secure connection within compatible electrical assemblies. HACR rating compatibility also makes this breaker suitable for heating, air conditioning, and refrigeration applications. Built to last and engineered for long-term serviceability, the TJK426300 remains a practical solution for maintaining and servicing existing electrical infrastructure.

Key Features and Benefits

• 300 Amp Continuous Current Rating: For commercial and industrial power distribution applications.
• 2-Pole Configuration: Designed for compatible AC electrical systems.
• Thermal Magnetic Trip Unit: Provides protection against overloads and short circuits.
• Internal Common Trip Mechanism: Helps disconnect both poles simultaneously during fault conditions.
• Bolt-On Mounting Design: Supports stable and secure installation.
• Q-Line Series Compatibility: For use in designated panelboards and distribution equipment.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration equipment applications.
• Includes Load-Side Lugs: Assists with installation and conductor termination.
• Non-Interchangeable Trip Unit: Maintains fixed protection settings for system consistency.
• Constructed for Long Service Life: Designed for demanding electrical environments.
  

Technical Specifications

• Part Number: TJK426300
  
• Type: TJK4
  
• Product Category: Molded Case Circuit Breaker
  
• Mounting Style: Bolt-On
  
• Poles: 2
  
• Amperes: 300A
  
• Trip Unit: Thermal Magnetic
  
• Trip Style: Internal Common Trip
  
• A.I.C. Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Series: Q-Line
  
• HACR Rated: Yes
  
• Lugs: Includes Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in
  • Width: 8.25 in
  • Depth: 3.81 in

Material Compliance and Certifications

• HACR Rated: Approved for HVAC-related applications.
• UL Compatibility: Manufactured for use in compatible UL-listed electrical distribution equipment.
• Performance Standards: Designed to meet applicable molded case circuit breaker construction and performance standards.
• Commercial and Industrial Applications: Suitable for electrical system applications where properly specified by a qualified professional.
  

Where It Works Best

• The TJK426300 circuit breaker is commonly used in commercial buildings and tenant electrical distribution systems, industrial control panels and manufacturing facilities, HVAC and refrigeration equipment installations, motor control and branch circuit protection applications, existing Q-Line panelboards and switchboard assemblies, and maintenance, repair, and replacement projects requiring compatible form, fit, and function components.