TJJ436300WL - 300A Circuit Breaker

TJJ436300WL - 300A Circuit Breaker

The TJJ436300WL molded case circuit breaker is designed for dependable circuit protection in your commercial and industrial electrical distribution systems where consistent overcurrent protection is essential. Built as part of the Q-Line series, this 3-pole, 300-amp breaker features a thermal-magnetic trip unit with internal common trip functionality to help protect connected equipment and conductors from overloads and short circuits. Its cable-in/cable-out lug-lug configuration simplifies installation in compatible systems, while the included line- and load-side lugs help support secure connections. With interrupting ratings up to 22kA at 600VAC, 30kA at 480VAC, and 42kA at 240VAC, the TJJ436300WL is well-suited for demanding electrical applications requiring reliable branch or feeder circuit protection. Built for long-term service, this breaker is commonly used as a form, fit, and functional replacement in existing electrical systems and facilities that continue to rely on proven infrastructure components.

Key Features and Benefits

• 300 Amp molded case circuit breaker: Designed for commercial and industrial power distribution.
• 3-pole configuration: Intended for three-phase electrical systems.
• Thermal magnetic trip unit: Helps protect against overloads and short circuits.
• Internal common trip mechanism: Disconnects all poles simultaneously during fault conditions.
• Q-Line construction: Supports compatibility with existing installations and legacy equipment setups.
• Cable-in/cable-out (lug-lug) design: Allows straightforward wiring connections.
• Included line-side and load-side lugs: Help support secure electrical connections.
• HACR rated: Suitable for heating, air conditioning, and refrigeration applications.
• Built for long-term durability: Intended for demanding electrical environments.
• Form, fit, and functional replacement: Suitable for compatible systems and existing infrastructure.
  

Technical Specifications

• Part Number: TJJ436300WL
  
• Type: TJJ
  
• Product Category: Molded Case Circuit Breaker
  
• Series: Q-Line
  
• Poles: 3
  
• Amperage Rating: 300A
  
• Voltage & A.I.C. Ratings: 22kA @ 600VAC; 30kA @ 480VAC; 42kA @ 240VAC
  
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Trip Function: Internal Common Trip
  
• Configuration: 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: Suitable for HVAC and refrigeration system applications.
• Commercial and Industrial Use: Manufactured for use in commercial and industrial electrical distribution systems.
• Construction Standards: Designed to meet applicable molded case circuit breaker construction and operational standards for its class.
• Professional Installation: Intended for installation by qualified electrical professionals in accordance with local electrical codes and system requirements.
  

Where It Works Best

• The TJJ436300WL circuit breaker is commonly used in commercial buildings, industrial facilities, manufacturing environments, distribution equipment, and large electrical panels requiring dependable 300A three-phase circuit protection. It is especially suitable for facilities maintaining existing Q-Line electrical systems where matching form, fit, and function are important for ongoing operation and maintenance. This breaker is also a practical choice for HVAC distribution equipment, motor loads, feeder circuits, and other applications requiring thermal magnetic protection with common trip functionality.