TJK436300 **Older Style** - 300Amp Circuit Breaker

TJK436300 **Older Style** - 300 Amp Circuit Breaker

The TJK436300 molded case circuit breaker is designed for your dependable protection in commercial and industrial electrical distribution systems where maintaining compatibility with existing equipment matters. Built as part of the Q-Line family, this 3-pole, 300-amp breaker features a thermal magnetic trip unit with internal common trip, helping you to protect connected systems from overloads and short circuits. Its bolt-on mounting design provides a secure installation in compatible panelboards and switchgear, while the included load-side lugs help simplify wiring during replacement or maintenance work. This older style black face configuration is commonly used in legacy electrical setups where exact form and fit are important for maintaining system continuity. The non-interchangeable trip unit helps preserve the breaker’s original protection characteristics, making it a practical choice for facilities looking to match existing equipment specifications. Built for long service life and rated for HACR applications, the TJK436300 is suitable for a wide range of power distribution environments, including manufacturing facilities, commercial buildings, and HVAC systems operating at higher voltage capacities.

Key Features and Benefits

• 300 Amp Current Rating: 300 Amp current rating for commercial and industrial power distribution.
• 3-Pole Configuration: 3-pole configuration designed for three-phase electrical systems.
• Older Style Black Face Design: Older style black face design for compatibility with existing installations.
• Q-Line Bolt-On Construction: Q-Line bolt-on construction for secure mounting.
• Thermal Magnetic Trip Unit: Thermal magnetic trip unit provides overload and short-circuit protection.
• Internal Common Trip Mechanism: Internal common trip mechanism helps disconnect all poles simultaneously during fault conditions.
• HACR Rated: HACR rated for heating, air conditioning, and refrigeration applications.
• Includes Load-Side Lugs: Includes load-side lugs for convenient installation.
• Molded Case Construction: Molded case construction designed for long-term durability in demanding environments.
• Non-Interchangeable Trip Unit: Non-interchangeable trip unit maintains consistent protection settings.
  

Technical Specifications

• Part Number: TJK436300
  
• Type: TJK4
  
• Product Style: Older Style Black Face
  
• Poles: 3
  
• Amperes: 300A
  
• Voltage & A.I.C. Ratings: 22k @ 600VAC; 30k @ 480VAC; 42k @ 240VAC
  
• Trip Unit: Thermal Magnetic
  
• Trip Style: Internal Common Trip
  
• Mounting Type: Bolt-On
  
• Series: Q-Line
  
• HACR Rated: Yes
  
• Included Accessories: Load-Side Lugs
  
• 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 compatible commercial and industrial electrical distribution systems.
• Molded Case Construction: Molded case construction designed to meet applicable industry standards for circuit protection equipment.
• Suitable Applications: Suitable for installations requiring properly rated thermal magnetic circuit protection devices.
  

Where It Works Best

• The TJK436300 circuit breaker is commonly used in commercial buildings, industrial facilities, electrical distribution panels, HVAC and refrigeration systems, manufacturing environments, legacy switchgear and panelboard applications, and three-phase power distribution systems requiring a 300A breaker replacement. Its older style black face configuration makes it especially useful where maintaining compatibility with existing equipment layout and appearance is important.