TJK436400WL **Older Style** 400Amp Circuit Breaker

TJK436400WL **Older Style** 400 Amp Circuit Breaker

The TJK436400WL molded case circuit breaker is designed for your dependable overcurrent protection in commercial and industrial electrical distribution systems where maintaining compatibility with existing equipment matters. Built as an older style black face configuration, this 400 amp, 3-pole breaker is commonly used in legacy switchgear, panelboards, and power distribution setups that require a direct form, fit, and function replacement. Its thermal magnetic trip unit provides protection against both overloads and short circuits, while the internal common trip mechanism helps you ensure all poles disconnect simultaneously during fault conditions.

This breaker features a cable-in/cable-out lug-lug design and includes both line-side and load-side lugs, helping simplify installation and replacement in systems already configured for TJK4-style breakers. With interrupting ratings up to 22kA at 600VAC, it is suited for demanding power distribution environments where reliable circuit protection is essential. The HACR rating also makes it appropriate for heating, air conditioning, and refrigeration applications. Built with the durability expected from industrial molded case breakers, the TJK436400WL continues to serve facilities that depend on proven electrical infrastructure and long-lasting components.

Key Features and Benefits

• 400 Amp Molded Case Circuit Breaker: Designed for commercial and industrial power distribution applications requiring dependable circuit protection.
• 3-Pole Configuration: Suitable for use in three-phase electrical systems commonly found in industrial and commercial environments.
• Older Style Black Face Design: Helps maintain compatibility with existing equipment layouts and legacy electrical infrastructure.
• Thermal Magnetic Trip Unit: Provides protection against overloads and short circuits for dependable electrical system operation.
• Internal Common Trip Mechanism: Disconnects all poles simultaneously during fault conditions to support system safety and protection.
• Cable-In/Cable-Out Lug-Lug Design: Simplifies installation and replacement in systems configured for TJK4-style breakers.
• Includes Line-Side and Load-Side Lugs: Helps streamline installation without requiring additional lug accessories.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration applications.
• Built for Legacy System Compatibility: Designed for use in retrofit and replacement projects requiring TJK4 compatibility.
• Durable Molded Case Construction: Built for long-term service use in demanding electrical distribution environments.
  

Technical Specifications

• Part Number: TJK436400WL
  
• Type: TJK4
  
• Circuit Breaker Style: Older Style Black Face
  
• Poles: 3
  
• Amperage: 400A
  
• Voltage / A.I.C. Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Connection Type: 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: Approved for heating, air conditioning, and refrigeration applications.
• Commercial and Industrial Use: Manufactured for use in commercial and industrial electrical distribution systems.
• Durable Molded Case Housing: Molded case insulated housing designed for electrical durability and protection.
• Industry Standards Compliance: Built to meet applicable industry standards associated with molded case circuit breakers of this type and rating.
  

Where It Works Best

• The TJK436400WL is well suited for facilities operating established electrical infrastructure where maintaining compatibility with existing switchgear and distribution equipment is important. Common applications include commercial buildings, industrial manufacturing facilities, mechanical and HVAC systems, distribution panels and switchboards, power distribution equipment, refrigeration and air conditioning systems, and retrofit or replacement projects involving TJK4 breaker configurations. Its combination of high amperage capacity, thermal magnetic protection, and legacy equipment compatibility makes it a practical solution for maintaining dependable electrical protection in existing systems.