TJJ426400WL - 400Amp Circuit Breaker

TJJ426400WL - 400 Amp Circuit Breaker

The TJJ426400WL molded case circuit breaker is designed for dependable protection in your commercial and industrial electrical distribution systems requiring a 400 amp, 2-pole configuration. Built as part of the trusted Q-Line family, this thermal magnetic circuit breaker features a non-interchangeable trip unit with internal common trip functionality for coordinated circuit protection and consistent operation under demanding electrical loads. Its cable-in/cable-out lug-lug design simplifies installation in a variety of switchgear and panelboard applications, while the included line and load-side lugs help reduce setup time in the field. Engineered for systems operating at up to 600VAC, the TJJ426400WL provides interrupting capacities suitable for many heavy-duty power distribution environments. The thermal magnetic trip mechanism is built to respond to both overloads and short circuits, helping you protect connected equipment and electrical infrastructure from damage caused by fault conditions. HACR rating compatibility also makes this breaker suitable for heating, air conditioning, and refrigeration applications where reliable circuit interruption is essential. With durable molded case construction and dimensions suited for legacy and existing installations, this breaker is a practical form, fit, and functional replacement solution for maintaining and servicing compatible electrical systems.

Key Features and Benefits

• 400 Amp Continuous Current Rating: For commercial and industrial power distribution applications.
• 2-Pole Configuration: Designed for compatible AC electrical systems.
• Thermal Magnetic Trip Unit: Helps provide dependable overload and short-circuit protection.
• Internal Common Trip Mechanism: Enhances coordinated breaker operation during fault events.
• Q-Line Design: Supports use in compatible legacy electrical equipment and assemblies.
• Cable-In/Cable-Out (Lug-Lug) Configuration: Allows straightforward field wiring connections.
• Includes Line and Load-Side Lugs: For installation convenience.
• HACR Rated: For heating, air conditioning, and refrigeration equipment applications.
• Molded Case Construction: Designed for long service life in demanding environments.
• Suitable as a Form, Fit, and Functional Replacement: In existing systems requiring Type TJJ breakers.
  

Technical Specifications

• Part Number: TJJ426400WL
  
• Type: TJJ
  
• Product Category: Molded Case Circuit Breaker
  
• Poles: 2
  
• Amperage: 400A
  
• Voltage Rating: Up to 600VAC
  
• A.I.C. Rating:
  • 22k @ 600VAC
  • 30k @ 480VAC
  • 42k @ 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: For compatible HVAC and refrigeration system applications.
• Manufactured for Use in Accordance with Applicable Standards: Manufactured for use in accordance with applicable molded case circuit breaker standards and electrical distribution requirements.
• Designed for Properly Rated Equipment and Systems: Designed for installation within properly rated electrical equipment and systems.
• Thermal Magnetic Protection Mechanism: Supports compliance-focused overcurrent protection strategies in commercial and industrial environments.
  

Where It Works Best

• The TJJ426400WL is commonly used in commercial buildings, industrial facilities, distribution panels, switchboards, motor control applications, and HVAC systems requiring a 400 amp, 2-pole molded case circuit breaker. It is especially well-suited for maintenance teams, electrical contractors, and facility managers seeking a compatible replacement breaker for existing Q-Line electrical systems. Its lug-lug configuration and included terminals make it a practical choice for retrofit projects, system repairs, and ongoing electrical infrastructure support where dependable circuit protection is required.