THJK426250 - 250Amp Circuit Breaker

THJK426250 - 250 Amp Circuit Breaker

The THJK426250 is a 250-amp, 2-pole molded case circuit breaker designed for dependable overcurrent and short-circuit protection in your commercial and industrial electrical distribution systems. As part of the THJK4 series, this Q-Line bolt-on circuit breaker features a non-interchangeable thermal-magnetic trip unit with an internal common trip, helping to provide consistent circuit protection while maintaining compatibility with designated panelboard and switchboard applications. Built for long service life in demanding electrical environments, this breaker includes load-side lugs for installation convenience. It is HACR rated, making it suitable for heating, air conditioning, and refrigeration equipment applications where permitted by code. With interrupting ratings of 25kA at 600VAC, 35kA at 480VAC, and 65kA at 240VAC, the THJK426250 is designed to help you protect electrical systems against damaging fault conditions while supporting the reliable operation of connected equipment.

Key Features and Benefits

• 250 Amp current rating: For higher-capacity electrical distribution applications.
• 2-pole configuration: For the protection of two energized conductors.
• Type THJK4 molded case circuit breaker: Designed for commercial and industrial electrical systems.
• Bolt-on mounting design: For secure installation.
• Thermal magnetic trip unit: Provides both overload and short-circuit protection.
• Internal common trip mechanism: Helps ensure coordinated tripping across both poles.
• Non-interchangeable trip unit design: Maintains compatibility with designated applications.
• HACR rated: For approved heating, air conditioning, and refrigeration applications.
• Includes load-side lugs: For simplified field installation.
• Built to withstand demanding environments: Suitable for commercial and industrial electrical systems.
• Designed for form, fit, and functional replacement requirements: In compatible equipment.
  

Technical Specifications

• Part Number: THJK426250
  
• Type: THJK4
  
• Circuit Breaker Style: Molded Case Circuit Breaker
  
• Mounting: Bolt-On
  
• Poles: 2
  
• Amperage Rating: 250 Amps
  
• Trip Unit: Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Trip Unit Type: Non-Interchangeable
  
• A.I.C. Rating: 25kA @ 600VAC
  
• A.I.C. Rating: 35kA @ 480VAC
  
• A.I.C. Rating: 65kA @ 240VAC
  
• HACR Rated: Yes
  
• Lugs: Includes Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: Heating, Air Conditioning, and Refrigeration Rated.
• Industry Standards: Manufactured to meet applicable industry standards for molded case circuit breaker applications.
• Installation Requirements: Designed for use in accordance with applicable electrical codes, equipment ratings, and installation requirements.
• Compatibility Verification: Verify system voltage, interrupting capacity, and equipment compatibility before installation.
  

Where It Works Best

• The THJK426250 is commonly used in commercial buildings, industrial facilities, manufacturing operations, distribution equipment, panelboards, switchboards, HVAC systems, and large electrical distribution networks requiring a 250A, 2-pole bolt-on molded case circuit breaker. It is well-suited for applications where proper overcurrent protection, fault interruption capability, and compatibility with existing THJK4-series installations are important. Its thermal magnetic trip design makes it an effective solution for protecting feeders, distribution circuits, and connected electrical equipment from overload and short-circuit conditions while maintaining reliable system operation.