TJK426400 **Older Style** - 400Amp Circuit Breaker

TJK426400 **Older Style** - 400 Amp Circuit Breaker

The TJK426400 Older Style Black Face molded case circuit breaker is built for your dependable protection in commercial and industrial electrical distribution systems where consistent overcurrent protection is critical. Designed as part of the trusted Q-Line family, this 2-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 configuration supports secure installation in compatible legacy panelboard and switchgear applications, making it a practical form, fit, and functional replacement for existing systems already using Type TJK4 breakers. With included load-side lugs and HACR rating, this breaker is well-suited for HVAC equipment, distribution panels, and heavy-duty electrical infrastructure where reliability and compatibility matter most. Built with durable molded case construction, the TJK426400 is designed to withstand demanding operating environments while maintaining dependable circuit protection over time.

Key Features and Benefits

• 400 Amp, 2-Pole Molded Case Circuit Breaker: Designed for dependable protection in commercial and industrial electrical distribution systems.
• Older Style Black Face Configuration: Supports compatibility with existing installations and legacy electrical systems.
• Type TJK4 Breaker: Designed for commercial and industrial electrical systems requiring reliable overcurrent protection.
• Thermal Magnetic Trip Unit: Helps protect against overloads and short circuits for connected equipment and circuits.
• Internal Common Trip Mechanism: Enhances multi-pole protection during fault conditions.
• Bolt-On Mounting Design: Allows secure installation in compatible panelboard and switchgear applications.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration applications where permitted by code and system design.
• Includes Load-Side Lugs: Provides added installation convenience for electrical contractors and maintenance personnel.
• Q-Line Series Construction: Built for long-term service in demanding operating environments.
• High Interrupting Capacity: Suitable for use in electrical distribution equipment requiring dependable circuit protection.
  

Technical Specifications

• Part Number: TJK426400
  
• Series: Q-Line
  
• Type: TJK4
  
• Poles: 2
  
• Amperage Rating: 400A
  
• Voltage / A.I.C. Rating: 22k @ 600VAC; 30k @ 480VAC; 42k @ 240VAC
  
• Trip Unit: Thermal Magnetic
  
• Trip Style: Non-Interchangeable
  
• Mounting Type: Bolt-On
  
• Face Style: Older Style Black Face
  
• HACR Rated: Yes
  
• Included Accessories: Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in
  • Width: 8.25 in
  • Depth: 3.81 in

Material Compliance and Certifications

• Commercial and Industrial Applications: The TJK426400 circuit breaker is manufactured for use in commercial and industrial electrical systems requiring dependable overcurrent protection and compatibility with applicable electrical distribution equipment.
• HACR Rating: The HACR rating supports use with heating, ventilation, air conditioning, and refrigeration equipment, provided it is permitted by code and system design. Always confirm installation requirements and compatibility with the intended electrical application and local electrical codes.
  

Where It Works Best

• The TJK426400 is commonly used in commercial buildings and industrial facilities, electrical distribution panels and switchgear, HVAC and refrigeration systems, manufacturing plants and processing facilities, and legacy electrical systems utilizing Type TJK4 breakers. Its combination of high interrupting capacity, thermal magnetic protection, and legacy compatibility makes it a practical choice for maintaining existing electrical infrastructure while helping keep systems operating safely and efficiently. It is also suitable for applications requiring high-amperage bolt-on circuit protection.