TJK436300WL - 300Amp Circuit Breaker

TJK436300WL - 300 Amp Circuit Breaker

The TJK436300WL molded case circuit breaker is designed for your dependable circuit protection in commercial and industrial electrical distribution systems. Built as part of the trusted TJK4 series, this 3-pole breaker features a non-interchangeable thermal-magnetic trip unit with internal common trip functionality to help you protect connected equipment from overloads and short circuits. Its cable-in/cable-out lug-lug configuration, along with included line and load-side lugs, supports straightforward installation in a wide range of panel and switchgear applications.

Rated at 300 amps, the TJK436300WL is HACR rated and engineered for systems operating up to 600VAC. The breaker’s compact molded case construction helps save panel space while maintaining the strength and durability expected in demanding electrical environments. Whether being used for maintenance, replacement, or system expansion, this breaker is built to last and designed to provide reliable protection for legacy and existing power distribution equipment.

Key Features and Benefits

• 300 amp molded case circuit breaker: For commercial and industrial power distribution.
• 3-pole configuration: For three-phase electrical systems.
• Thermal magnetic trip unit: Provides protection against overloads and short circuits.
• Internal common trip mechanism: Helps disconnect all poles simultaneously during fault conditions.
• Cable-in/cable-out (lug-lug) design: Supports flexible installation.
• Includes line-side and load-side lugs: Supports straightforward installation in a wide range of panel and switchgear applications.
• HACR rated: For heating, air conditioning, and refrigeration applications.
• Compact molded case construction: Helps fit space-sensitive electrical assemblies.
• Designed for compatibility with existing TJK4-series equipment and systems: Supports form, fit, and functional replacement compatibility.
• Built for long-term use: In demanding operating environments.
  

Technical Specifications

• Part Number: TJK436300WL
  
• Type: TJK4
  
• Circuit Breaker Style: Molded Case Circuit Breaker
  
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Poles: 3
  
• Amperes: 300A
  
• Voltage & A.I.C. Ratings:
  • 22k @ 600VAC
  • 30k @ 480VAC
  • 42k @ 240VAC
• Configuration: Cable-in/Cable-out (Lug-Lug)
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.
• Additional Features: Internal Common Trip, Includes Line and Load-Side Lugs, HACR Rated
  

Material Compliance and Certifications

• HACR Rated: Approved for HVAC and refrigeration applications.
• Manufactured Standards: Manufactured for use in accordance with applicable molded case circuit breaker standards.
• Commercial and Industrial Use: Designed for use in properly rated commercial and industrial electrical systems.
• Thermal Magnetic Trip Technology: Supports dependable overcurrent protection.
  

Where It Works Best

• The TJK436300WL is well suited for commercial buildings, industrial facilities, manufacturing environments, HVAC systems, distribution panels, and switchgear installations requiring a 300A, 3-pole molded case circuit breaker. It is commonly used in existing electrical systems where TJK4-series breakers are specified for form, fit, and functional replacement compatibility.