THJK436400WL - 400Amp Circuit Breaker

THJK436400WL - 400 Amp Circuit Breaker

The THJK436400WL is a 400 Amp, 3-pole molded case circuit breaker designed for use in your commercial and industrial power distribution systems requiring dependable overcurrent and short-circuit protection. Part of the THJK4 Q-Line series, this breaker features a thermal magnetic trip unit with internal common trip, providing coordinated protection against both overload and fault conditions. Its cable-in/cable-out (lug-lug) configuration includes both line-side and load-side lugs, helping you to simplify installation in switchboards, panelboards, and other distribution equipment where direct cable termination is required.

Built for long service life in demanding electrical environments, the THJK436400WL combines a compact footprint with substantial interrupting capacity. With interrupting ratings of 25kA at 600VAC, 35kA at 480VAC, and 65kA at 240VAC, it is suitable for a wide range of power distribution applications. The breaker is also HACR rated, making it appropriate for heating, air conditioning, and refrigeration equipment installations where applicable.

Key Features and Benefits

• 400 Amp Continuous Current Rating: 400 Amp continuous current rating.
• 3-Pole Configuration: 3-pole configuration for three-phase electrical systems.
• THJK4 Series Design: THJK4 series molded case circuit breaker.
• Thermal Magnetic Trip Unit: Thermal magnetic trip unit for overload and short-circuit protection.
• Internal Common Trip Mechanism: Internal common trip mechanism for coordinated operation across all poles.
• Q-Line Compatibility: Q-Line design for compatibility with designated electrical distribution equipment.
• Cable-In/Cable-Out Construction: Cable-in/cable-out (lug-lug) construction.
• Included Lugs: Includes both line-side and load-side lugs.
• HACR Rated: HACR rated for HVAC and refrigeration applications.
• Compact Design: Compact design helps maximize available equipment space.
• Dependable Protection: Built to provide dependable circuit protection in commercial and industrial environments.
  

Technical Specifications

• Part Number: THJK436400WL
  
• Type: THJK4
  
• Product Family: Q-Line
  
• Circuit Breaker Type: Molded Case Circuit Breaker
  
• Poles: 3
  
• Amperes: 400A
  
• Trip Unit: Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Connection Type: Cable-In/Cable-Out (Lug-Lug)
  
• Included Accessories: Line and Load-Side Lugs
  
• Interrupting Ratings:
  • 25kA @ 600VAC
  • 35kA @ 480VAC
  • 65kA @ 240VAC
• HACR Rated: Yes
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: HACR Rated.
• Commercial and Industrial Use: Manufactured for use in commercial and industrial electrical distribution systems.
• Industry Standards: Designed to meet applicable industry standards for molded case circuit breakers.
• Installation Notice: Verify local code requirements and equipment compatibility before installation.
  

Where It Works Best

• The THJK436400WL is commonly used in commercial facilities, manufacturing plants, institutional buildings, utility distribution equipment, and large HVAC installations requiring a 400A three-phase circuit breaker. Its lug-lug configuration makes it well-suited for applications where direct cable termination is preferred, while the thermal magnetic trip unit provides practical protection for feeders, distribution circuits, and connected electrical equipment. This breaker is often selected as a form, fit, and function replacement in existing systems utilizing compatible THJK4 and Q-Line distribution equipment.