TJJ436300 **Older Style** - 300Amp Circuit Breaker

TJJ436300  **Older Style** - 300 Amp Circuit Breaker

When you’re maintaining an existing electrical distribution system, finding the right breaker isn’t just about matching amperage — it’s about getting the right fit, the right configuration, and dependable protection you can trust in the field. The GE TJJ436300 Q-Line molded case circuit breaker is built for exactly that purpose. Designed with the older-style black-face configuration, this 3-pole, 300-amp breaker fits seamlessly into compatible legacy GE Q-Line systems where maintaining original equipment compatibility is important.

Built with a thermal magnetic trip unit and internal common trip functionality, the TJJ436300 helps protect electrical systems from overloads and short circuits while supporting stable, consistent operation in commercial and industrial environments. Its bolt-on mounting design provides a secure installation, while the included load-side lugs help reduce installation time during maintenance or replacement projects. The HACR rating also makes this breaker a practical choice for HVAC and refrigeration equipment applications. Whether it’s used in a manufacturing facility, a commercial panelboard, or a power distribution setup, this breaker is designed to deliver the form, fit, and functional replacement needed to keep existing systems operating smoothly for years to come.

Key Features and Benefits

• Designed for compatibility with existing GE Q-Line electrical systems: Helps support maintenance and replacement projects involving legacy GE Q-Line equipment.
• Older style black face configuration: Matches legacy installations where maintaining original equipment appearance and compatibility is important.
• 300A current rating: Suitable for commercial and industrial power distribution applications requiring a 300-amp breaker.
• 3-pole breaker design: Intended for use in three-phase electrical systems.
• Thermal magnetic trip unit: Helps provide dependable overload and short-circuit protection.
• Internal common trip mechanism: Supports coordinated breaker operation during fault conditions.
• Bolt-on mounting design: Allows for secure installation in compatible equipment.
• Includes load-side lugs: Helps simplify installation and maintenance procedures.
• HACR rated: Suitable for heating, air conditioning, and refrigeration equipment applications.
• Molded case construction: Built for long service life in demanding commercial and industrial environments.
  

Technical Specifications

• Part Number: TJJ436300
  
• Series: Q-Line
  
• Breaker Type: Molded Case Circuit Breaker
  
• Mounting Style: Bolt-On
  
• Trip Unit: Thermal Magnetic
  
• Poles: 3
  
• Amperage Rating: 300A
  
• A.I.C. Rating: 22k @ 600VAC; 30k @ 480VAC; 42k @ 240VAC
  
• Dimensions:
  • Height: 10.13"
  • Width: 8.25"
  • Depth: 3.81"
• Face Style: Older Style Black Face
  
• Additional Features: HACR Rated, Internal Common Trip, Includes Load-Side Lugs
  

Material Compliance and Certifications

• Commercial and Industrial Application Design: The GE TJJ436300 circuit breaker is designed for use in commercial and industrial electrical distribution systems that require reliable overcurrent protection and compatibility with established electrical equipment configurations.
• HACR Rated: This breaker is HACR-rated and designed for applications requiring dependable molded-case circuit protection.
  

Where It Works Best

• The TJJ436300 works especially well in commercial buildings, industrial facilities, electrical distribution panels, switchgear systems, and HVAC-related applications where a 300A, 3-pole bolt-on breaker is required. It is commonly used in maintenance and retrofit projects where matching the original breaker style and specifications helps minimize system modifications and downtime. For facilities operating existing GE Q-Line equipment, this breaker offers a practical replacement solution that helps keep systems running safely and efficiently.