TJK426300WL - 300Amp Circuit Breaker

TJK426300WL - 300Amp Circuit Breaker

The TJK426300WL molded case circuit breaker is designed for your commercial and industrial power distribution systems that require dependable overcurrent and short-circuit protection in higher-amperage applications. Built as part of the trusted Q-Line family, this 2-pole, 300-amp breaker features a non-interchangeable thermal magnetic trip unit with internal common trip functionality for consistent circuit protection across both poles. Its cable-in/cable-out lug-lug configuration simplifies installation in switchboards, panelboards, and distribution equipment where secure line and load terminations are essential. With interrupting capacities rated up to 42k A.I.C. at 240VAC, 30k A.I.C. at 480VAC, and 22k A.I.C. at 600VAC, the TJK426300WL is well-suited for demanding electrical systems operating across multiple voltage environments. Designed with durability in mind, this breaker is built to last while supporting reliable operation in legacy and existing electrical infrastructures.

Key Features and Benefits

• 300-amp molded case circuit breaker: Designed for commercial and industrial electrical distribution systems.
• 2-pole configuration: Features internal common trip protection.
• Thermal Magnetic Trip Unit: Helps provide dependable overload and short-circuit protection.
• Non-Interchangeable Trip Unit: Maintains fixed protection settings.
• Q-Line Series Compatibility: Supports form, fit, and functional replacement applications.
• Cable-in/Cable-out Lug-Lug Design: Supports secure conductor terminations.
• Included Accessories: Includes both line-side and load-side lugs.
• HACR Rated: Suitable for heating, air conditioning, and refrigeration equipment applications.
• High Interrupting Capacity: Suitable for installations requiring high interrupting capacity ratings.
• Compact Molded Case Construction: Supports space-conscious equipment layouts.
  

Technical Specifications

• Part Number: TJK426300WL
  
• Type: TJK4
  
• Product Category: Molded Case Circuit Breaker
  
• Poles: 2
  
• Amperage Rating: 300A
  
• Trip Unit: Thermal Magnetic, Non-Interchangeable
  
• Trip Style: Internal Common Trip
  
• A.I.C. Ratings:
  • 42k @ 240VAC
  • 30k @ 480VAC
  • 22k @ 600VAC
• Configuration: Cable-in/Cable-out (Lug-Lug)
  
• Included Accessories: Line and Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: Manufactured for use in commercial and industrial electrical distribution systems.
• Performance Standards: Designed to meet applicable molded case circuit breaker performance standards for listed equipment applications.
  

Where It Works Best

• The TJK426300WL is commonly used in commercial buildings, industrial facilities, manufacturing plants, and large electrical distribution systems that require a 300A, 2-pole breaker with dependable thermal-magnetic protection. It is a practical choice for panelboards, switchgear, motor distribution equipment, HVAC systems, and legacy electrical setups where Q-Line compatibility and fixed-trip protection are required. Its higher interrupting ratings also make it suitable for applications where available fault current demands stronger short-circuit protection.