TJJ436300WL **Older Style** - 300Amp Circuit Breaker

TJJ436300WL  **Older Style** - 300 Amp Circuit Breaker

The TJJ436300WL molded case circuit breaker is designed for your dependable circuit protection in commercial and industrial electrical distribution systems where consistent overcurrent and short-circuit protection is required. Built with an older style black face, this 3-pole, 300-amp breaker features a non-interchangeable thermal magnetic trip unit with internal common trip, helping protect connected equipment and conductors during overload or fault conditions. Its cable-in/cable-out lug-lug configuration simplifies installation in compatible systems, while included line- and load-side lugs help support secure conductor connections. Commonly used in switchboards, panelboards, motor control applications, and large electrical distribution setups, the TJJ436300WL is well-suited for maintaining and servicing existing power systems that require a matching form, fit, and function replacement component. Built to last and engineered for reliable operation, this breaker is also HACR rated, making it suitable for heating, air conditioning, and refrigeration equipment applications.

Key Features and Benefits

• 300 Amp Continuous Current Rating: Designed for commercial and industrial power distribution applications requiring dependable high-current protection.
• 3-Pole Configuration: Designed for use in three-phase electrical systems commonly found in industrial and commercial facilities.
• Older Style Black Face Design: Helps support compatibility with existing installations and legacy equipment setups where matching appearance and configuration are important.
• Thermal Magnetic Trip Unit: Provides protection against overloads and short circuits for connected conductors and equipment.
• Internal Common Trip Mechanism: Helps disconnect all poles simultaneously during fault conditions for improved system protection.
• Cable-In/Cable-Out (Lug-Lug) Configuration: Supports straightforward field wiring connections during installation and maintenance.
• Included Line- and Load-Side Lugs: Helps support secure conductor terminations and installation convenience.
• HACR Rated: Suitable for use with heating, air conditioning, and refrigeration equipment applications.
• Molded Case Construction: Designed for durability and reliable operation in demanding electrical environments.
• Legacy System Compatibility: Suitable for maintaining and servicing existing electrical distribution systems requiring Type TJJ breakers.
  

Technical Specifications

• Part Number: TJJ436300WL
  
• Type: TJJ
  
• Frame Style: Older Style Black Face
  
• Poles: 3
  
• Amperage: 300A
  
• Voltage & A.I.C. Ratings: 22k @ 600VAC; 30k @ 480VAC; 42k @ 240VAC
  
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Trip Style: Internal Common Trip
  
• Configuration: Cable-in/Cable-out (Lug-Lug)
  
• HACR Rated: Yes
  
• Included Accessories: Line and Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in
  • Width: 8.25 in
  • Depth: 3.81 in

Material Compliance and Certifications

• Industry Standards: The TJJ436300WL circuit breaker is manufactured for use in applicable commercial and industrial electrical systems and is designed to meet industry-standard operational and safety expectations for molded case circuit breakers.
• HACR Rating: The HACR rating supports use in HVAC-related applications where compatible equipment specifications require it. Proper installation and application should always follow local electrical codes and equipment requirements.
  

Where It Works Best

• The TJJ436300WL is commonly used in commercial buildings, industrial facilities, electrical distribution panels, switchboards and panelboards, HVAC and refrigeration systems, manufacturing environments, and maintenance and replacement projects involving legacy Type TJJ breaker installations. Its older style black face configuration makes it especially useful when maintaining system consistency in existing electrical equipment where matching dimensions, connection style, and operating characteristics are important.