TJJ426350 **Older Style** - 350Amp Circuit Breaker

TJJ426350 **Older Style** - 350 Amp Circuit Breaker

The TJJ426350 molded-case circuit breaker is a 2-pole, 350-amp thermal-magnetic circuit breaker designed for your dependable protection in commercial and industrial electrical distribution systems. Built as part of the trusted Q-Line family, this bolt-on breaker features an older-style black-face configuration commonly used in legacy installations where matching form, fit, and function matter. Its non-interchangeable thermal magnetic trip unit provides consistent overcurrent and short-circuit protection, while the internal common trip mechanism helps ensure both poles disconnect simultaneously during fault conditions.

Designed for demanding power distribution applications, the TJJ426350 is HACR-rated and suitable for systems requiring reliable branch and feeder circuit protection. The included load-side lugs simplify installation and help you reduce setup time in compatible panelboards and switchgear assemblies. With interrupting ratings up to 42k A.I.C. at 240VAC, this breaker is built to last and continues to serve as a practical replacement solution for maintaining existing electrical infrastructure.

Key Features and Benefits

• 350 amp, 2-pole molded case circuit breaker: Designed for dependable protection in commercial and industrial electrical distribution systems.
• Older style black face design: Provides compatibility with existing equipment and legacy installations where matching form, fit, and function matter.
• Type TJJ configuration: Built for designated Q-Line systems with bolt-on mounting to help provide a secure electrical connection.
• Thermal magnetic trip unit: Delivers both overload and short-circuit protection with a non-interchangeable trip unit design.
• Internal common trip mechanism: Disconnects both poles simultaneously during fault events for dependable protection.
• HACR rated: Suitable for heating, air conditioning, and refrigeration applications where permitted by code and system design.
• Load-side lugs included: Helps simplify installation and reduce setup time in compatible panelboards and switchgear assemblies.
• Commercial and industrial applications: Built for demanding power distribution systems and maintaining existing electrical infrastructure.
  

Technical Specifications

• Part Number: TJJ426350
  
• Type: TJJ
  
• Product Family: Q-Line
  
• Poles: 2
  
• Amperes: 350A
  
• Trip Unit: Thermal Magnetic
  
• Trip Style: Non-Interchangeable
  
• Mounting Style: Bolt-On
  
• Common Trip: Internal Common Trip
  
• A.I.C. Rating @ 240VAC: 42k
  
• A.I.C. Rating @ 480VAC: 30k
  
• A.I.C. Rating @ 600VAC: 22k
  
• 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: The TJJ426350 circuit breaker is designed for use in commercial and industrial electrical systems that require dependable overcurrent protection and compliance with applicable electrical standards. This breaker is HACR-rated, making it suitable for heating, ventilation, air conditioning, and refrigeration equipment applications, provided it is permitted by code and system design.
  

Where It Works Best

• The TJJ426350 is commonly used in commercial buildings, industrial facilities, electrical distribution panels, motor control applications, HVAC and refrigeration systems, existing Q-Line breaker installations requiring compatible replacement components, and legacy switchboards and panelboards utilizing older-style black face breakers. Its combination of high amperage capacity, bolt-on installation, and established TJJ configuration makes it a dependable choice for maintaining and servicing existing electrical systems where compatibility and proper protection are essential.