TJK436125 **Older Style** - 125Amp Circuit Breaker

TJK436125 **Older Style** - 125 Amp Circuit Breaker

The TJK436125 molded case circuit breaker is designed for your dependable circuit protection in commercial and industrial electrical distribution systems that require a 125-amp, 3-pole breaker with established TJK4 compatibility. Built with an older-style black-face configuration, this breaker is commonly used in existing Q-Line equipment where maintaining proper form, fit, and function is critical. Its thermal magnetic trip unit protects against overloads and short circuits, while the internal common trip mechanism helps you disconnect all poles simultaneously during fault conditions. The bolt-on mounting design supports a secure installation in compatible panelboards and switchgear applications. HACR-rated and constructed for long-term service in demanding environments, the TJK436125 includes load-side lugs for added installation convenience.

Key Features and Benefits

• 125-amp molded case circuit breaker: For commercial and industrial power distribution.
• 3-pole configuration: Designed for multi-phase electrical systems.
• Older style black face construction: For compatibility with legacy equipment setups.
• Thermal magnetic trip unit: Helps provide consistent overload and short-circuit protection.
• Internal common trip mechanism: Disconnects all poles during fault events.
• Bolt-on mounting style: Supports a secure and stable connection.
• Includes load-side lugs: For streamlined installation.
• HACR rated: For use in heating, air conditioning, and refrigeration applications.
• Built for long service life: In demanding electrical environments.
• Designed for Q-Line applications: Requiring Type TJK4 compatibility.
  

Technical Specifications

• Part Number: TJK436125
  
• Type: TJK4
  
• Frame Style: Older Style Black Face
  
• Poles: 3
  
• Amperes: 125A
  
• Trip Unit: Non-Interchangeable Thermal Magnetic
  
• Mounting Type: Bolt-On
  
• Interrupting Rating:
  • 22k A.I.C. @ 600VAC
  • 30k A.I.C. @ 480VAC
  • 42k A.I.C. @ 240VAC
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.
• Included Accessories: Load-Side Lugs
  
• Application Rating: HACR Rated
  
• Trip Function: Internal Common Trip
  

Material Compliance and Certifications

• Industry Standards: The TJK436125 circuit breaker is manufactured and tested to meet applicable industry standards for molded case circuit breakers used in low-voltage power distribution systems.
• HACR Certification: Supports use in HVAC and refrigeration-related applications where compatible equipment specifications are required. Proper installation and application should always follow local electrical codes and equipment manufacturer requirements.
  

Where It Works Best

• The TJK436125 is well-suited for use in commercial buildings, industrial facilities, manufacturing equipment, HVAC systems, and electrical distribution panels requiring a compatible Type TJK4 breaker. It is commonly installed in existing Q-Line systems where maintaining original equipment configuration and electrical ratings is important. This breaker is especially useful in facilities seeking a direct functional replacement for aging or installed equipment without modifying existing panel layouts or mounting arrangements.