TJK436300 - 300Amp Circuit Breaker

TJK436300 - 300 Amp Circuit Breaker

When your dependable power distribution is at stake, the TJK436300 molded case circuit breaker is built to handle the job. This 3-pole, 300-amp breaker is designed for commercial and industrial electrical systems that require reliable protection against overloads and short circuits. As part of the trusted Q-Line series, it features a bolt-on design for secure installation and long-term use in demanding environments.

Equipped with a non-interchangeable thermal magnetic trip unit and an internal common trip, the TJK436300 helps you to protect connected equipment by disconnecting all poles during a fault condition. Its HACR rating makes it a practical choice for HVAC and refrigeration systems, while the included load-side lugs streamline installation and maintenance. Whether it’s being used in panelboards, switchgear, or motor control applications, this breaker is designed to match the form and fit requirements of existing systems while delivering the protection electrical professionals expect.

Built for systems operating up to 600VAC, the TJK436300 offers interrupting ratings of 22kA at 600VAC, 30kA at 480VAC, and 42kA at 240VAC. Its molded case construction is made to last, helping support consistent operation in everyday commercial and industrial applications.

Key Features and Benefits

• 300 Amp Rating: Designed for commercial and industrial power distribution applications requiring dependable overcurrent protection.
• 3-Pole Configuration: Suitable for three-phase electrical systems commonly used in commercial and industrial environments.
• Thermal Magnetic Trip Unit: Helps protect against overloads and short circuits using a non-interchangeable thermal magnetic trip design.
• Internal Common Trip: Disconnects all poles simultaneously during fault conditions to help protect connected equipment.
• Bolt-On Mounting: Features a bolt-on mounting design for secure equipment installation and long-term reliability.
• HACR Rated: Appropriate for HVAC and refrigeration applications requiring HACR-rated circuit protection.
• Load-Side Lugs Included: Includes load-side lugs to help simplify installation and maintenance procedures.
• Type TJK4 Compatibility: Designed for compatibility with Type TJK4 systems and equipment.
• Molded Case Construction: Built for long service life in demanding commercial and industrial environments.
  

Technical Specifications

• Part Number: TJK436300
  
• Type: TJK4
  
• Product Category: Molded Case Circuit Breaker
  
• Poles: 3
  
• Amperage: 300A
  
• A.I.C. Rating & Volts: 22kA @ 600VAC; 30kA @ 480VAC; 42kA @ 240VAC
  
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Mounting Style: Bolt-On
  
• Series: Q-Line
  
• Trip Function: Internal Common Trip
  
• Included Accessories: Load-Side Lugs
  
• HACR Rated: Yes
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: Rated for heating, air conditioning, and refrigeration applications requiring dependable overcurrent protection.
• Commercial and Industrial Use: Designed for use in commercial and industrial electrical distribution systems.
• Thermal Magnetic Protection: Supports branch and feeder circuit protection requirements using thermal magnetic trip technology.
• Industry Standards: Manufactured to meet applicable molded case circuit breaker standards.
  

Where It Works Best

• The TJK436300 is commonly used in commercial facilities, industrial buildings, manufacturing operations, and large HVAC systems where dependable overcurrent protection is required. It works well in panelboards, switchboards, motor control centers, and distribution equipment that require a Type TJK4 breaker with bolt-on mounting. Its form, fit, and functional compatibility make it a practical solution for maintaining existing electrical systems without requiring equipment modifications.