TJK436400 **Older Style** 400A Circuit Breaker

TJK436400 **Older Style** 400A Circuit Breaker

The TJK436400 molded case circuit breaker is designed for your dependable protection in commercial and industrial electrical distribution systems requiring a 400 amp, 3-pole configuration. Built as part of the trusted TJK4 series, this breaker features an older style black face design and is commonly used in existing switchgear, panelboards, and distribution equipment where exact form, fit, and function compatibility matters. Its thermal magnetic trip unit provides protection against overloads and short circuits, while the internal common trip mechanism help you to ensure all poles disconnect simultaneously during fault conditions. Designed with bolt-on mounting and load-side lugs included, the TJK436400 is well-suited for maintenance, replacement, and service applications in legacy power systems that continue to operate every day in demanding environments.

Constructed for long-term service life, this HACR-rated circuit breaker is engineered to handle a range of industrial and commercial power distribution needs. With interrupting capacities rated at 22k A.I.C. at 600VAC, 30k A.I.C. at 480VAC, and 42k A.I.C. at 240VAC, the TJK436400 delivers the protection and compatibility required for many high-capacity electrical systems. Its non-interchangeable trip unit design also helps maintain consistent protection settings in applications where fixed trip characteristics are preferred.

Key Features and Benefits

• 400 amp molded case circuit breaker: Designed for commercial and industrial power distribution.
• 3-pole configuration: Designed for three-phase electrical systems.
• Older style black face: Provides compatibility with existing equipment layouts.
• Thermal magnetic trip unit: Helps protect against overloads and short circuits.
• Internal common trip mechanism: Disconnects all poles simultaneously during fault events.
• Bolt-on mounting design: Supports secure installation.
• HACR rated: Approved for heating, air conditioning, and refrigeration applications.
• Includes load-side lugs: Simplifies connection and installation.
• Non-interchangeable trip unit: Maintains fixed protection settings.
• Built to last: Designed for demanding electrical environments.
  

Technical Specifications

• Part Number: TJK436400
  
• Type: TJK4
  
• Product Style: Older Style Black Face
  
• Circuit Breaker Type: Molded Case Circuit Breaker
  
• Poles: 3
  
• Amperage Rating: 400A
  
• Trip Unit: Thermal Magnetic
  
• Trip Configuration: Internal Common Trip
  
• Mounting Style: Bolt-On
  
• A.I.C. Rating:
  • 22k @ 600VAC
  • 30k @ 480VAC
  • 42k @ 240VAC
• HACR Rated: Yes
  
• Lugs: Includes Load-Side Lugs
  
• Dimensions:
  • Height: 10.13 in
  • Width: 8.25 in
  • Depth: 3.81 in

Material Compliance and Certifications

• HACR Rated: Approved for HVAC and refrigeration applications.
• Commercial and Industrial Use: Manufactured for use in commercial and industrial electrical distribution systems.
• Industry Standards: Designed to meet applicable industry standards for molded case circuit breakers.
• Equipment Compatibility: Suitable for use in properly rated panelboards and switchgear assemblies.
  

Where It Works Best

• The TJK436400 circuit breaker is commonly used in manufacturing facilities, commercial buildings, industrial control systems, HVAC equipment, and electrical distribution panels requiring a 400A, 3-pole bolt-on breaker. It is especially useful in existing installations where maintaining compatibility with older electrical equipment is important. Its form, fit, and functional design make it a practical choice for service replacements, preventative maintenance programs, and ongoing facility operations.