TJJ426300 - 300Amp Circuit Breaker

TJJ426300 - 300 Amp Circuit Breaker

The TJJ426300 molded case circuit breaker is designed for dependable circuit protection in your commercial and industrial electrical distribution systems requiring a 2-pole, 300 amp solution. Built as part of the Q-Line series, this bolt-on breaker features a non-interchangeable thermal magnetic trip unit with internal common trip functionality to help protect connected equipment from overloads and short circuits. Its HACR rating also makes it suitable for heating, air conditioning, and refrigeration applications where consistent protection is essential. Designed with load-side lugs included, the TJJ426300 is made to support straightforward installation in compatible panelboards and distribution setups. With strong interrupting ratings up to 600VAC, this breaker is built to last and remains a practical replacement option for maintaining existing electrical infrastructure and keeping systems operating safely and efficiently.

Key Features and Benefits

• 300-amp molded case circuit breaker: Designed for commercial and industrial power distribution applications.
• 2-pole configuration: Compatible with electrical systems requiring 2-pole protection.
• Q-Line bolt-on mounting style: Supports secure installation in compatible panelboards and distribution systems.
• Thermal magnetic trip unit: Helps provide protection against overloads and short circuits for connected equipment.
• Internal common trip mechanism: Enhances coordinated circuit interruption functionality.
• HACR rated: Suitable for heating, air conditioning, and refrigeration equipment applications.
• Includes load-side lugs: Adds convenience during installation and setup.
• Non-interchangeable trip unit configuration: Helps maintain proper system compatibility.
• Compact design: Supports use in panelboards and switchgear applications where space matters.
• Built for long-term use: Suitable for demanding electrical environments requiring dependable operation.
  

Technical Specifications

• Part Number: TJJ426300
  
• Type: TJJ
  
• Product Series: Q-Line
  
• Circuit Breaker Type: Molded Case Circuit Breaker
  
• Mounting Style: Bolt-On
  
• Poles: 2
  
• Amperage: 300A
  
• Trip Unit: Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Interrupting Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• HACR Rated: Yes
  
• Included Accessories: 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 and refrigeration applications requiring compliant overcurrent protection.
• Commercial and Industrial Compatibility: Manufactured for use in compatible commercial and industrial electrical distribution systems.
• Construction and Operational Standards: Designed to meet applicable molded case circuit breaker construction and operational standards.
• Code-Compliant Replacement Applications: Suitable for installations requiring dependable overcurrent protection and code-compliant replacement components.
  

Where It Works Best

• The TJJ426300 circuit breaker is commonly used in commercial buildings, manufacturing facilities, mechanical equipment rooms, and industrial distribution systems requiring a 300-amp, 2-pole protective device. It is well-suited for HVAC equipment, panelboards, switchgear assemblies, motor protection applications, and other high-capacity electrical systems where matching form, fit, and function are important for maintaining existing infrastructure compatibility.