TJJ436400 **Older Style** - 400Amp Circuit Breaker

TJJ436400  **Older Style** - 400 Amp Circuit Breaker

The TJJ436400 molded case circuit breaker is a 3-pole, 400-amp breaker designed for your commercial and industrial electrical distribution systems that require dependable overcurrent protection in legacy panel and switchgear applications. Built with a thermal magnetic trip unit and internal common trip functionality, this breaker is engineered to help you protect electrical equipment from overloads and short circuits while maintaining compatibility with existing Q-Line bolt-on systems. Its older-style black-face configuration makes it a practical form, fit, and function replacement for maintaining established electrical infrastructure without unnecessary modifications.

Designed with durability in mind, the TJJ436400 features a non-interchangeable trip unit and includes load-side lugs for straightforward installation. The breaker is HACR rated, making it suitable for heating, air conditioning, and refrigeration equipment applications where reliable circuit protection is essential. With interrupting capacities rated at 22kA at 600VAC, 30kA at 480VAC, and 42kA at 240VAC, this unit is well-suited for a wide range of demanding power distribution environments. Whether installed in manufacturing facilities, commercial buildings, or industrial control systems, the TJJ436400 provides the compatibility and electrical protection needed to keep systems operating safely and efficiently.

Key Features and Benefits

• 400-amp molded case circuit breaker: Designed for commercial and industrial power distribution.
• Older style black face configuration: Provides compatibility with legacy equipment setups.
• 3-pole design: Supports three-phase electrical systems.
• Bolt-on mounting style: Allows secure installation in Q-Line systems.
• Thermal magnetic trip unit: Helps protect against overloads and short circuits.
• Internal common trip mechanism: Disconnects all poles simultaneously during fault conditions.
• HACR rated: Suitable for heating, air conditioning, and refrigeration applications.
• Includes load-side lugs: Adds installation convenience.
• Built to last: Designed for demanding electrical environments.
  

Technical Specifications

• Part Number: TJJ436400
  
• Type: TJJ
  
• Product Category: Molded Case Circuit Breaker
  
• Mounting Style: Bolt-On
  
• Poles: 3
  
• Amperes: 400A
  
• Voltage / A.I.C. Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Trip Unit: Thermal Magnetic
  
• Trip Style: Internal Common Trip
  
• Trip Unit Type: Non-Interchangeable
  
• 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: Suitable for HVAC and refrigeration equipment applications.
• Electrical System Compatibility: Designed for use in accordance with applicable electrical system requirements and installation standards.
• Molded Case Construction: Intended for long-term use in commercial and industrial environments.
  

Where It Works Best

• The TJJ436400 circuit breaker is commonly used in commercial electrical distribution panels, industrial switchgear and control systems, manufacturing facilities, HVAC and refrigeration systems, three-phase power applications, and existing Q-Line electrical systems that require compatible replacement breakers. It is ideal for facilities maintaining legacy electrical infrastructure while ensuring dependable overcurrent protection and compatibility with established equipment.