TJJ436400 - 400Amp Circuit Breaker

TJJ436400 - 400 Amp Circuit Breaker

The TJJ436400 molded case circuit breaker is designed for your commercial and industrial electrical distribution systems that require dependable overcurrent protection in higher-amperage applications. Built as part of the Q-Line series, this 3-pole, 400-amp breaker features a thermal-magnetic trip unit with internal common trip functionality to help you protect connected equipment and circuits from overloads and short circuits. Its bolt-on mounting design supports secure installation in compatible panelboards and switchgear, while the included load-side lugs simplify wiring connections during maintenance or replacement projects.

With interrupting ratings of 22kA at 600VAC, 30kA at 480VAC, and 42kA at 240VAC, the TJJ436400 is suited for demanding power distribution environments where reliable circuit interruption is essential. The non-interchangeable trip unit helps maintain consistent protection settings, making this breaker a practical fit for facilities operating legacy electrical systems or maintaining existing infrastructure. HACR rating compatibility also makes it suitable for heating, air conditioning, and refrigeration applications that require approved protection devices.

Built with durability in mind, the TJJ436400 offers the form, fit, and function needed for servicing and maintaining existing electrical systems without unnecessary modifications. Its compact molded case design allows for efficient use of panel space while delivering the protection expected in commercial and industrial operations.

Key Features and Benefits

• 400 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: Protects against overloads and short circuits.
• Internal Common Trip Mechanism: Helps disconnect all poles simultaneously during fault conditions.
• Bolt-On Mounting Style: Supports stable and secure installation.
• Includes Load-Side Lugs: Simplifies wiring connections during installation and maintenance.
• HACR Rated: Suitable for compatible HVAC and refrigeration applications.
• Q-Line Series Compatibility: Designed for use in compatible legacy electrical equipment.
• Compact Molded Case Construction: Helps maximize available panel space.
• Built for Long-Term Service: Suitable for demanding electrical environments.
  

Technical Specifications

• Part Number: TJJ436400
  
• Type: TJJ
  
• Product Category: Molded Case Circuit Breaker
  
• Series: Q-Line
  
• Poles: 3
  
• Amperage: 400A
  
• Voltage Ratings: 240VAC / 480VAC / 600VAC
  
• Interrupting Rating: 42kA @ 240VAC
  
• Interrupting Rating: 30kA @ 480VAC
  
• Interrupting Rating: 22kA @ 600VAC
  
• Trip Unit: Thermal Magnetic
  
• Trip Style: Internal Common Trip
  
• Mounting Type: Bolt-On
  
• Lugs: Includes 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: Approved for heating, air conditioning, and refrigeration applications.
• Commercial and Industrial Compatibility: Designed and manufactured for use in compatible commercial and industrial electrical systems.
• Molded Case Construction: Helps protect internal components in demanding operating conditions.
• Engineered Standards Compliance: Built to meet applicable electrical distribution and circuit protection standards associated with its class and ratings.
  

Where It Works Best

• The TJJ436400 circuit breaker is commonly used in commercial buildings, industrial facilities, manufacturing environments, and large electrical distribution systems requiring 400-amp three-phase circuit protection. It is especially suitable for maintaining or servicing existing Q-Line compatible equipment, including panelboards, switchboards, and HVAC-related electrical systems. Facilities operating legacy infrastructure often use this breaker when matching existing specifications, dimensions, and mounting requirements is important for continued system operation.