TJK436400 - 400Amp Circuit Breaker

TJK436400 - 400 Amp Circuit Breaker

The TJK436400 molded case circuit breaker is designed for your dependable circuit protection in commercial and industrial electrical distribution systems where consistent performance and compatibility matter. Built as part of the trusted TJK4 family, this 3-pole, 400-amp breaker features a thermal magnetic trip unit with internal common trip functionality to help protect equipment and electrical systems from overloads and short circuits. Its bolt-on mounting design for your supports secure installation in compatible panelboards and switchgear applications, while the included load-side lugs help simplify wiring connections during service or replacement work.

Engineered for use in demanding environments, the TJK436400 offers interrupting ratings of 22 kA at 600 VAC, 30 kA at 480 VAC, and 42 kA at 240 VAC, making it suitable for a wide range of power distribution applications. The non-interchangeable trip unit design helps maintain factory-configured protection settings, which can be especially important in facilities that rely on consistent electrical coordination. HACR rating compatibility also makes this breaker appropriate for heating, air conditioning, and refrigeration equipment installations. With its durable molded case construction and proven thermal magnetic protection system, the TJK436400 is built to last in everyday operating conditions.

Key Features and Benefits

• 400 Amp Molded Case Circuit Breaker: Designed for commercial and industrial power distribution.
• 3-Pole Configuration: Protects three-phase electrical systems.
• Thermal Magnetic Trip Unit: Provides both overload and short-circuit protection.
• Internal Common Trip Design: Helps disconnect all poles simultaneously during fault conditions.
• Bolt-On Mounting: Supports a stable and secure installation.
• Includes Load-Side Lugs: Allows convenient field wiring.
• HACR Rated: Suitable for compatible HVAC and refrigeration applications.
• Non-Interchangeable Trip Unit: Maintains fixed protection settings.
• Molded Case Construction: Built for long-term service in demanding electrical environments.
  

Technical Specifications

• Part Number: TJK436400
  
• Type: TJK4
  
• Poles: 3
  
• Amperage: 400A
  
• Voltage / A.I.C. Rating:
  • 22kA @ 600VAC
  • 30kA @ 480VAC
  • 42kA @ 240VAC
• Trip Unit: Thermal Magnetic
  
• Mounting Style: Bolt-On
  
• Trip Configuration: Internal Common Trip
  
• Lug Configuration: 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 use with heating, air conditioning, and refrigeration equipment applications.
• Applicable Standards: Designed to meet applicable molded case circuit breaker construction and operational standards.
• Reliable Protection: The thermal magnetic protection system supports reliable fault interruption and overload protection.
• Equipment Compatibility: Suitable for use in properly matched and rated electrical distribution equipment.
  

Where It Works Best

• The TJK436400 circuit breaker is commonly used in commercial buildings, industrial facilities, manufacturing operations, and large electrical distribution systems requiring 400-amp overcurrent protection. It is well-suited for panelboards, switchboards, and equipment tied to HVAC systems, motor loads, distribution feeders, and other three-phase applications that require bolt-on compatibility and dependable thermal-magnetic protection. Its form and fit make it a practical replacement option for maintaining existing electrical systems and legacy equipment configurations.