THJK436400 - 400Amp Circuit Breaker

THJK436400 - 400 Amp Circuit Breaker

The THJK436400 molded-case circuit breaker is a 400-amp, 3-pole unit designed for use in your commercial and industrial electrical distribution systems that require dependable overcurrent and short-circuit protection. Part of the THJK4 Q-Line series, this bolt-on circuit breaker features a thermal magnetic trip unit with internal common trip functionality, helping you to protect connected equipment and conductors from overload and fault conditions. Built for applications operating up to 600VAC, the THJK436400 combines a compact footprint with substantial interrupting capacity, making it suitable for a wide range of power distribution installations. The breaker includes load-side lugs for simplified field connections and is HACR rated, making it appropriate for heating, air conditioning, and refrigeration equipment applications where applicable. Designed for long service life, this circuit breaker provides a form, fit, and functional replacement option for compatible electrical systems requiring a THJK4 frame breaker.

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 Frame Design: THJK4 frame design for compatible installations.
• Bolt-On Mounting Style: Bolt-on mounting style for secure panelboard integration.
• Thermal Magnetic Trip Unit: The thermal magnetic trip unit provides overload and short-circuit protection.
• Internal Common Trip Mechanism: The internal common trip mechanism trips all poles simultaneously during fault conditions.
• HACR Rated: HACR rated for use with heating, air conditioning, and refrigeration equipment applications.
• Load-Side Lugs Included: Includes load-side lugs for convenient conductor termination.
• Suitable for Systems Operating up to 600VAC: Suitable for systems operating up to 600VAC.
• Long-Term Durability: Constructed for long-term durability in demanding electrical environments.
  

Technical Specifications

• Part Number: THJK436400
  
• Type: THJK4
  
• Current Rating: 400 Amps
  
• Number of Poles: 3
  
• Mounting Style: Bolt-On
  
• Trip Unit: Thermal Magnetic
  
• Trip Function: Internal Common Trip
  
• A.I.C. Rating @ 240VAC: 65kA
  
• A.I.C. Rating @ 480VAC: 35kA
  
• A.I.C. Rating @ 600VAC: 25kA
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.
• Included Accessories: Load-Side Lugs
  
• Rating: HACR Rated
  

Material Compliance and Certifications

• Industry Standards: The THJK436400 circuit breaker is manufactured and tested to meet applicable industry standards for molded case circuit breakers.
• HACR Rating: Its HACR rating supports use in qualifying heating, ventilation, air conditioning, and refrigeration applications.
• Compliance Verification: Always verify compliance requirements and installation suitability based on local electrical codes, equipment specifications, and project requirements.
  

Where It Works Best

• The THJK436400 is commonly used in commercial, industrial, and institutional electrical distribution systems that require a 400A, 3-pole molded case circuit breaker. Typical applications include distribution panels, switchboards, motor loads, HVAC equipment, manufacturing facilities, processing plants, and large commercial buildings. It is especially well-suited for installations requiring a bolt-on breaker with high interrupting ratings and thermal magnetic protection characteristics.