THJK426300WL - 300Amp Circuit Breaker

THJK426300WL - 300 Amp Circuit Breaker

The THJK426300WL is a 2-pole, 300-amp molded case circuit breaker designed for use in your commercial and industrial electrical distribution systems where dependable overcurrent protection is required. As part of the THJK4 Series, this circuit breaker features a thermal magnetic trip unit with an internal common trip mechanism, helping protect connected equipment and conductors from overloads and short circuits. Built with a cable-in/cable-out (lug-lug) configuration, the breaker includes both line-side and load-side lugs for straightforward installation. Its durable molded case construction is designed to provide long service life in demanding electrical environments.

The THJK426300WL offers interrupting ratings of 25kA at 600VAC, 35kA at 480VAC, and 65kA at 240VAC. The non-interchangeable trip unit helps maintain consistent protection settings throughout the life of the breaker. Additionally, the breaker is HACR rated, making it suitable for heating, air conditioning, and refrigeration equipment applications where specified. Whether used in switchboards, panelboards, distribution equipment, or other power distribution systems, this breaker provides the form, fit, and function needed for maintaining or replacing compatible electrical protection devices in existing installations.

Key Features and Benefits

• 300-amp current rating: For high-capacity power distribution applications.
• 2-pole design: For protecting two energized conductors simultaneously.
• THJK4 Series molded case circuit breaker: Designed for commercial and industrial electrical distribution systems.
• Thermal magnetic trip unit: Provides protection against overloads and short-circuit conditions.
• Internal common trip mechanism: Helps ensure coordinated tripping across poles.
• Cable-in/cable-out (lug-lug) configuration: For flexible installation.
• Includes line-side and load-side lugs: For straightforward installation.
• HACR rated: Suitable for qualifying heating, air conditioning, and refrigeration applications.
• Non-interchangeable trip unit: Maintains fixed protection settings.
• Built to withstand the demands of commercial and industrial electrical systems.
  

Technical Specifications

• Part Number: THJK426300WL
  
• Series: THJK4
  
• Type: Molded Case Circuit Breaker
  
• Poles: 2
  
• Amperage Rating: 300A
  
• Trip Unit: Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Configuration: Cable-In/Cable-Out (Lug-Lug)
  
• Included Accessories: Line and Load-Side Lugs
  
• Interrupting Rating: 25kA @ 600VAC
  
• Interrupting Rating: 35kA @ 480VAC
  
• Interrupting Rating: 65kA @ 240VAC
  
• HACR Rated: Yes
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR (Heating, Air Conditioning, and Refrigeration) Rated: Suitable for HVAC and refrigeration-related applications where HACR-rated protection is specified.
• Manufactured for use in electrical distribution and protection applications requiring molded case circuit breakers.
• Designed to meet applicable industry standards associated with its original manufacturing specifications.
• Thermal magnetic protection technology: For overload and short-circuit protection.
  

Where It Works Best

• The THJK426300WL is commonly used in commercial buildings, industrial facilities, power distribution systems, panelboards, switchboards, and equipment requiring a 300A, 2-pole overcurrent protection device. Its lug-lug configuration and high interrupting ratings make it well-suited for applications where reliable circuit protection and compatibility with existing electrical infrastructure are important considerations. It is also appropriate for HVAC and refrigeration-related installations where HACR-rated protection is specified.