TJJ436400WL **Older Style** - 400Amp Circuit Breaker

TJJ436400WL **Older Style** - 400 Amp Circuit Breaker

The TJJ436400WL 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 essential. Designed as part of the trusted Q-Line family, this 3-pole, 400-amp breaker features a thermal magnetic trip unit with internal common trip functionality to help you safeguard connected equipment and electrical infrastructure from overloads and short circuits. Its cable-in/cable-out lug-lug configuration, along with included line- and load-side lugs, supports straightforward installation in compatible legacy systems and existing panel configurations. The older-style black-face design also makes it a suitable form, fit, and functional replacement, maintaining continuity in established electrical setups where matching equipment characteristics matters. Built to withstand demanding operating conditions, this breaker is HACR-rated and engineered for long service life in HVAC applications, power distribution systems, manufacturing facilities, and other heavy-duty environments.

Key Features and Benefits

• 400A Molded Case Circuit Breaker: Designed for commercial and industrial power distribution applications where dependable overcurrent protection is required.
• Older Style Black Face Configuration: Supports compatibility with existing legacy equipment and established electrical system layouts.
• Q-Line Breaker Design: Provides dependable circuit protection in compatible electrical distribution systems.
• Thermal Magnetic Trip Unit: Protects against overloads and short circuits to help safeguard connected equipment and infrastructure.
• Internal Common Trip Mechanism: Helps ensure coordinated disconnection across all poles during fault conditions.
• Cable-In/Cable-Out Lug-Lug Configuration: Simplifies conductor termination for installation in compatible systems.
• Includes Line-Side and Load-Side Lugs: Supports straightforward installation and replacement requirements.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration system applications.
• Built for Long-Term Durability: Engineered for demanding electrical environments including HVAC systems, manufacturing facilities, and power distribution systems.
• Form, Fit, and Functional Replacement: Designed for use in existing compatible installations requiring matching equipment characteristics.
  

Technical Specifications

• Part Number: TJJ436400WL
  
• Type: TJJ
  
• Breaker Style: Older Style Black Face
  
• Poles: 3
  
• Amperage Rating: 400 Amps
  
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• A.I.C. Rating:
  • 22k @ 600VAC
  • 30k @ 480VAC
  • 42k @ 240VAC
• Configuration: Cable-in/Cable-out (Lug-Lug)
  
• 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 within commercial and industrial electrical systems.
• Industry Standards: Manufactured for use in commercial and industrial electrical distribution applications and designed to meet applicable industry standards for molded case circuit breakers.
• Suitable Installation Applications: Intended for installation in compatible electrical systems requiring listed overcurrent protection devices.
  

Where It Works Best

• The TJJ436400WL circuit breaker is commonly used in commercial buildings, industrial facilities, HVAC systems, manufacturing operations, distribution panels, and large electrical service applications that require reliable 400-amp overcurrent protection. Its older-style black face design makes it especially useful for maintaining consistency in existing equipment layouts and legacy electrical systems where compatible replacement components are needed.