TJJ426300WL **Older Style** - 300Amp Circuit Breaker

TJJ426300WL **Older Style** - 300 Amp Circuit Breaker

The TJJ426300WL molded case circuit breaker is designed for dependable protection in your commercial and industrial electrical distribution systems, where maintaining compatibility with existing equipment is critical. Built as an older-style black-face Type TJJ breaker, this 2-pole, 300-amp unit features a non-interchangeable thermal magnetic trip unit with internal common trip functionality to help protect connected systems from overloads and short circuits. Its cable-in/cable-out lug-lug configuration allows for straightforward installation in compatible legacy switchgear and panel applications. At the same time, the included line- and load-side lugs help you to simplify field setup.

Engineered for applications requiring high interrupting capacity, the TJJ426300WL delivers interrupting ratings up to 22 kA at 600 VAC, making it well-suited for demanding electrical environments. The HACR rating supports use in heating, air conditioning, and refrigeration equipment applications where compliant overcurrent protection is required. Designed with durability in mind, this molded case circuit breaker is built to last. It serves as a practical, form-, fit-, and function-compatible replacement for existing compatible systems that rely on Type TJJ breakers.

Key Features and Benefits

• 2-pole molded case circuit breaker rated at 300 amps: Designed for dependable protection in commercial and industrial electrical distribution systems.
• Older style black face configuration: Supports compatibility with existing installations and legacy equipment setups.
• Type TJJ breaker design: Intended for use in compatible legacy electrical distribution equipment.
• Thermal magnetic trip unit: Protects against overloads and short circuits during operation.
• Internal common trip mechanism: Helps disconnect both poles simultaneously during fault conditions.
• Cable-in/cable-out (lug-lug) connection style: Supports straightforward field wiring and installation.
• Includes line-side and load-side lugs: Helps simplify field setup in compatible systems.
• HACR rated: Suitable for HVAC and refrigeration equipment applications requiring compliant overcurrent protection.
• Compact molded case design: Suitable for commercial and industrial environments.
• Built for long-term service: Designed for demanding electrical systems and ongoing operation.
  

Technical Specifications

• Part Number: TJJ426300WL
  
• Type: TJJ
  
• Poles: 2
  
• Amperage: 300A
  
• Voltage / A.I.C. Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Trip Function: Internal Common Trip
  
• Configuration: Cable-in/Cable-out (Lug-Lug)
  
• Certifications: HACR Rated
  
• Included Accessories: Line and Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: The TJJ426300WL circuit breaker is HACR-rated for use in heating, air conditioning, and refrigeration applications requiring compliant branch-circuit protection.
• Commercial and Industrial Use: Its molded case construction is intended for use in commercial and industrial electrical systems where dependable overcurrent protection and compatibility with existing equipment are essential.
  

Where It Works Best

• Commercial electrical distribution systems
• Industrial control panels and switchgear
• HVAC and refrigeration equipment installations
• Manufacturing facilities
• Legacy power distribution systems requiring Type TJJ compatibility
• Facilities seeking a form, fit, and functional replacement breaker for existing equipment configurations