TJK436300WL **Older Style** - 300Amp Circuit Breaker

TJK436300WL **Older Style** - 300 Amp Circuit Breaker

The TJK436300WL molded case circuit breaker is designed for your dependable protection in commercial and industrial electrical distribution systems where maintaining compatibility with existing equipment matters. This older style black face configuration is commonly used in legacy installations requiring a form, fit, and functional replacement without modifying the original setup. Built with a thermal magnetic trip unit and internal common trip, this 3-pole breaker helps you to protect connected equipment and conductors from overloads and short circuits while supporting consistent operation in demanding environments.

Configured as a cable-in/cable-out (lug-lug) breaker, the TJK436300WL includes both line-side and load-side lugs for straightforward installation. Its Q-Line construction and non-interchangeable trip unit design make it well-suited for facilities that rely on stable, fixed protection settings. With a 300 amp rating and interrupting capacities up to 22kA at 600VAC, this breaker is often found in switchboards, panelboards, distribution equipment, and HVAC-related applications where HACR-rated protection is required. Built to last and engineered for long-term serviceability, this breaker remains a practical solution for maintaining existing power distribution systems.

Key Features and Benefits

• 300 Amp Molded Case Circuit Breaker: Designed for commercial and industrial power distribution applications.
• 3-Pole Configuration: Designed for three-phase electrical systems.
• Older Style Black Face: Commonly used for compatibility with existing installations requiring legacy replacement configurations.
• Thermal Magnetic Trip Unit: Provides overload and short-circuit protection for connected equipment and conductors.
• Internal Common Trip Mechanism: Helps disconnect all poles simultaneously during fault conditions.
• Cable-in/Cable-out Lug-Lug Design: Simplifies conductor termination and installation.
• Includes Line and Load-Side Lugs: Supports straightforward installation requirements.
• Q-Line Configuration: Commonly used in legacy electrical systems requiring compatible replacement breakers.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration applications.
• Non-Interchangeable Trip Unit: Supports fixed protection settings for stable operation.
• Built for Long Service Life: Designed for demanding commercial and industrial electrical environments.
  

Technical Specifications

• Part Number: TJK436300WL
  
• Type: TJK4
  
• Circuit Breaker Style: Older Style Black Face
  
• Poles: 3
  
• Amperage Rating: 300A
  
• Voltage / A.I.C. Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Trip Unit: Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Connection Type: Cable-in/Cable-out (Lug-Lug)
  
• Included Accessories: Line and Load-Side Lugs
  
• HACR Rated: Yes
  
• Dimensions:
  • Height: 10.13 in
  • Width: 8.25 in
  • Depth: 3.81 in

Material Compliance and Certifications

• HACR Rated: Designed for HVAC and refrigeration system applications.
• Commercial and Industrial Applications: Designed for use in commercial and industrial electrical distribution systems.
• Molded Case Circuit Breaker Construction: Manufactured for branch and feeder protection applications.
• Industry Standards: Built to meet applicable industry standards associated with its original production classification and electrical ratings.
  

Where It Works Best

• The TJK436300WL is commonly used in commercial buildings, industrial facilities, manufacturing plants, mechanical and HVAC distribution systems, electrical panelboards and switchgear, and legacy Q-Line electrical systems requiring compatible replacement breakers. Its form, fit, and functional compatibility make it especially useful when maintaining or servicing existing equipment without redesigning the electrical system while supporting existing three-phase power distribution infrastructure.