THJK426350 - 350Amp Circuit Breaker

THJK426350 - 350 Amp Circuit Breaker

The THJK426350 molded case circuit breaker is a 2-pole, 350-amp thermal magnetic circuit breaker designed for use in your commercial and industrial electrical distribution systems. Part of the trusted THJK4 Series, this bolt-on circuit breaker features an internal common trip mechanism and a non-interchangeable thermal magnetic trip unit that helps you to provide dependable overcurrent and short-circuit protection. Built for demanding applications, the THJK426350 is HACR rated and includes load-side lugs for streamlined installation. Its compact design and high interrupting capacity make it well-suited for protecting feeders, distribution equipment, and large electrical loads where reliable circuit protection is essential.

Designed with durability in mind, the THJK426350 is built to last and helps maintain safe, efficient operation in electrical systems operating at up to 600VAC. Whether serving as a direct replacement in an existing installation or supporting ongoing maintenance requirements, this circuit breaker offers the form, fit, and function needed for compatible THJK4 applications.

Key Features and Benefits

• 350 Amp Continuous Current Rating: 350 Amp continuous current rating.
• 2-Pole Configuration: 2-pole configuration for protecting two-phase circuits.
• THJK4 Series Molded Case Circuit Breaker: THJK4 Series molded case circuit breaker.
• Bolt-On Mounting Design: Bolt-on mounting design for secure installation.
• Thermal Magnetic Trip Unit: Thermal magnetic trip unit provides overload and short-circuit protection.
• Internal Common Trip Mechanism: Internal common trip mechanism helps ensure simultaneous pole operation during fault conditions.
• Non-Interchangeable Trip Unit Design: Non-interchangeable trip unit design.
• HACR Rated: HACR rated for heating, air conditioning, and refrigeration applications.
• Load-Side Lugs Included: Includes load-side lugs.
• Built to Last: Built to last in commercial and industrial environments.
• Suitable for Systems up to 600VAC: Suitable for systems up to 600VAC.
  

Technical Specifications

• Part Number: THJK426350
  
• Series: THJK4
  
• Type: Molded Case Circuit Breaker
  
• Poles: 2
  
• Amperage Rating: 350A
  
• Trip Unit: Thermal Magnetic
  
• Trip Type: Internal Common Trip
  
• Mounting: Bolt-On
  
• A.I.C. Rating @ 240VAC: 65kA
  
• A.I.C. Rating @ 480VAC: 35kA
  
• A.I.C. Rating @ 600VAC: 25kA
  
• HACR Rated: Yes
  
• Lugs Included: Load-Side Lugs Included
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: HACR Rated.
• Industry Standards: Manufactured for use in accordance with applicable industry standards for molded case circuit breakers.
• Thermal Magnetic Protection Technology: Thermal magnetic protection technology.
• Equipment Compatibility: Designed for installation in compatible electrical distribution equipment.
  

Where It Works Best

• The THJK426350 is commonly used in commercial buildings, industrial facilities, manufacturing operations, utility infrastructure, and large electrical distribution systems requiring a 350-amp, 2-pole circuit breaker. Its high interrupting ratings and bolt-on design make it suitable for feeder protection, motor loads, HVAC equipment, panelboards, switchboards, and other power distribution applications where dependable overcurrent protection is required. It is particularly well-suited for installations utilizing compatible THJK4 series equipment where maintaining proper fit and function is important.