THKMA826400 - 400Amp Circuit Breaker

THKMA826400 - 400 Amp Circuit Breaker

The THKMA826400 is a 400 Amp, 2-pole THKM8 molded case circuit breaker designed for protecting your electrical distribution systems from overloads and short circuits in commercial and industrial applications. Featuring a thermal magnetic trip unit with internal common trip, this breaker provides dependable circuit protection while helping you to maintain system safety and operational continuity. Its bolt-on mounting design allows for secure installation, and the included load-side lugs simplify conductor termination. Built for long service life in demanding environments, the THKMA826400 combines a high interrupting capacity with a field-proven design commonly found in switchboards, panelboards, motor control equipment, and other power distribution systems. The interchangeable thermal magnetic trip unit offers flexibility while maintaining the form, fit, and function required for compatible installations. As an HACR-rated circuit breaker, it is also suitable for use in heating, air conditioning, and refrigeration applications where appropriate ratings are required.

Key Features and Benefits

• 400 Amp current rating: For large commercial and industrial power distribution systems.
• 2-pole configuration: For protecting 240V, 480V, and 600V AC circuits.
• THKM8 molded case circuit breaker design: For compatible replacement applications.
• Thermal magnetic trip unit: Helps protect against both overload and short-circuit conditions.
• Interchangeable trip unit: Supports maintenance and system configuration requirements.
• Internal common trip mechanism: Ensures coordinated operation across both poles.
• Bolt-on mounting design: Provides secure mechanical and electrical connections.
• Includes load-side lugs: For straightforward conductor termination.
• HACR rated: For applicable heating, air conditioning, and refrigeration installations.
• Built to last: In demanding electrical distribution environments.
  

Technical Specifications

• Part Number: THKMA826400
  
• Type: THKM8
  
• Current Rating: 400 Amps
  
• Number of Poles: 2
  
• Trip Unit: Thermal Magnetic
  
• Trip Style: Internal Common Trip
  
• Mounting: Bolt-On
  
• Interrupting Rating:
  • 25kA @ 600VAC
  • 35kA @ 480VAC
  • 65kA @ 240VAC
• HACR Rated: Yes
  
• Lugs: Includes Load-Side Lugs
  
• Dimensions:
  • Height: 15.5 in.
  • Width: 8.25 in.
  • Depth: 5.5 in.

Material Compliance and Certifications

• HACR Rated: The THKMA826400 is manufactured for use in electrical power distribution applications and is HACR rated for qualifying heating, ventilation, air conditioning, and refrigeration systems.
• Industry Performance Requirements: This molded case circuit breaker is designed to meet applicable industry performance requirements associated with its interrupting and voltage ratings.
• Installation Requirements: Users should verify compliance with local codes, installation requirements, and equipment specifications prior to installation.
  

Where It Works Best

• The THKMA826400 is well suited for a wide range of commercial and industrial electrical systems requiring high-capacity circuit protection. Typical applications include:
• Industrial manufacturing facilities
• Commercial buildings and office complexes
• Distribution panels and switchboards
• Motor control centers
• HVAC and refrigeration equipment
• Power distribution systems requiring a 400A, 2-pole molded case circuit breaker
• Replacement installations where a THKM8 breaker with matching ratings and configuration is specified
• Its combination of high interrupting capacity, thermal magnetic protection, bolt-on construction, and interchangeable trip unit design makes it a practical choice for maintaining compatibility and dependable circuit protection in existing electrical infrastructure.