TJK426350 **Older Style** - 350Amp Circuit Breaker

TJK426350 **Older Style** - 350 Amp Circuit Breaker

The TJK426350 molded case circuit breaker is designed for your dependable circuit protection in commercial and industrial electrical distribution systems that require a 350 amp, 2-pole configuration. Built as part of the trusted Q-Line family, this breaker features a thermal magnetic trip unit with internal common trip functionality to help you protect connected equipment from overloads and short circuits. Its older style black face design makes it a practical form, fit, and function replacement for existing installations using compatible legacy equipment.

Constructed for bolt-on mounting applications, the TJK426350 includes load-side lugs for streamlined installation and secure conductor termination. The non-interchangeable trip unit helps maintain consistent protection settings within the electrical system, while HACR rating compatibility supports use in heating, air conditioning, and refrigeration applications. With interrupting capacities rated up to 42k A.I.C. at 240VAC, this circuit breaker is built to last and suited for demanding power distribution environments where dependable operation matters every day.

Key Features and Benefits

• 350-amp molded case circuit breaker: Designed for commercial and industrial power distribution.
• 2-pole configuration: Supports compatible multi-phase electrical systems.
• Older style black face design: Supports compatibility with existing legacy equipment.
• Bolt-on mounting style: Provides secure installation within approved panel systems.
• Thermal magnetic trip unit: Responds to both overload and short-circuit conditions.
• Internal common trip mechanism: Helps disconnect all poles simultaneously during fault events.
• Includes load-side lugs: Allows convenient wiring connections.
• HACR rated: Approved for heating, air conditioning, and refrigeration applications.
• Q-Line series construction: Recognized for long-term durability and dependable service life.
• Non-interchangeable trip unit: Helps maintain fixed protection settings.
  

Technical Specifications

• Part Number: TJK426350
  
• Type: TJK4
  
• Product Style: Older Style Black Face
  
• Poles: 2
  
• Amperage: 350A
  
• Voltage / A.I.C. Ratings:
  • 22k @ 600VAC
  • 30k @ 480VAC
  • 42k @ 240VAC
• Mounting Style: Bolt-On
  
• Trip Unit: Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Lugs: Includes Load-Side Lugs
  
• HACR Rated: Yes
  
• Dimensions:
  • Height: 10.13 in.
  • Width: 8.25 in.
  • Depth: 3.81 in.

Material Compliance and Certifications

• HACR Rated: Approved for heating, ventilation, air conditioning, and refrigeration applications.
• Commercial and Industrial Use: Manufactured for use in compatible commercial and industrial electrical distribution systems.
• Thermal Magnetic Protection: Designed to support industry-standard overload and short-circuit protection requirements.
• Electrical Installation Standards: Built for use in accordance with applicable electrical equipment installation standards and system requirements.
  

Where It Works Best

• The TJK426350 circuit breaker is commonly used in commercial buildings, industrial facilities, distribution panels, and HVAC-related electrical systems requiring dependable 350 amp protection. It is especially well-suited for maintaining or servicing existing electrical infrastructure that utilizes compatible Q-Line bolt-on breaker configurations and older-style black-face equipment. Typical applications include motor control systems, panelboards, switchboards, machinery protection, and large facility power distribution setups where reliable overcurrent protection is essential.