TJK436400WL - 400Amp Circuit Breaker

TJK436400WL - 400 Amp Molded Case Circuit Breaker

The TJK436400WL molded case circuit breaker is designed for your dependable circuit protection in commercial and industrial electrical distribution systems where consistent overcurrent protection is essential. Built as part of the trusted Q-Line TJK4 series, this 3-pole breaker features a 400-amp rating, a non-interchangeable thermal-magnetic trip unit, and 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 a wide range of panel and switchgear applications, while the included line- and load-side lugs help you support secure conductor terminations. With interrupting capacities rated up to 22kA at 600VAC, this breaker is suited for demanding power distribution environments where durability, compatibility, and reliable operation matter. Designed with long-term serviceability in mind, the TJK436400WL remains a practical choice for maintaining and supporting existing electrical infrastructure.

Key Features and Benefits

• 400 Amp Molded Case Circuit Breaker: Designed for commercial and industrial power distribution systems.
• 3-Pole Configuration: Intended for three-phase electrical applications.
• Thermal Magnetic Trip Unit: Helps provide protection against overloads and short circuits.
• Internal Common Trip Mechanism: Disconnects all poles simultaneously during fault conditions.
• Q-Line TJK4 Series Construction: Supports compatibility with existing equipment configurations.
• Cable-in/Cable-out (Lug-Lug) Design: Allows for straightforward conductor termination.
• Included Line-Side and Load-Side Lugs: Supports installation convenience.
• HACR Rated: Suitable for use in heating, air conditioning, and refrigeration equipment applications.
• Compact Molded Case Design: Helps conserve panel space while maintaining service accessibility.
• Built for Long-Term Use: Suitable for demanding electrical environments.
  

Technical Specifications

• Part Number: TJK436400WL
  
• Series: TJK4 / Q-Line
  
• Device Type: Molded Case Circuit Breaker
  
• Poles: 3
  
• Amperage Rating: 400A
  
• Trip Unit: Non-Interchangeable Thermal Magnetic Trip Unit
  
• Trip Style: Internal Common Trip
  
• Connection Type: Cable-in/Cable-out (Lug-Lug)
  
• Interrupting Capacity:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.
• Included Accessories: Line and Load-Side Lugs
  
• Application Rating: HACR Rated
  

Material Compliance and Certifications

• Industry Standards: The TJK436400WL circuit breaker is manufactured for use in accordance with established industry electrical protection standards and is HACR rated for approved HVAC-related applications.
• Commercial and Industrial Use: Its molded case construction is intended for use in commercial and industrial environments requiring dependable branch and feeder circuit protection. Always confirm local code requirements and application compatibility before installation.
  

Where It Works Best

• The TJK436400WL is commonly used in commercial facilities, industrial buildings, manufacturing environments, mechanical equipment rooms, and large electrical distribution systems that require a 400A three-phase circuit breaker. It is especially well suited for maintaining existing Q-Line electrical systems, panelboards, and switchgear where matching form, fit, and function are important for continued operation and system compatibility.