THKMA826300 - 300Amp Circuit Breaker

THKMA826300 - 300 Amp Circuit Breaker

When your electrical distribution system requires dependable overcurrent protection, the THKMA826300 molded case circuit breaker delivers the form, fit, and function needed for demanding commercial and industrial applications. Rated at 300 amps with a 2-pole configuration, this breaker is designed to help protect equipment and electrical systems from overloads and short circuits while supporting the safe operation of critical power distribution infrastructure.

Built on the THKM8 platform, the THKMA826300 features an interchangeable thermal magnetic trip unit that combines long-time overload protection with instantaneous response to fault conditions. Its internal common trip mechanism ensures both poles operate together during a fault event, helping maintain system protection and compliance with application requirements. The breaker's bolt-on design provides a secure installation, while the included load-side lugs help streamline conductor termination during installation or replacement projects.

With interrupting ratings of 65kA at 240VAC, 35kA at 480VAC, and 25kA at 600VAC, the THKMA826300 is commonly found in commercial facilities, industrial plants, and large electrical distribution systems where higher fault current capacities are required. It is also HACR rated, making it suitable for use in many heating, air conditioning, and refrigeration applications.

Built to last and designed for long-term service, the THKMA826300 remains a practical choice for maintaining existing equipment and restoring electrical systems that require a compatible THKM8-series circuit breaker.

Key Features and Benefits

• 300-amp current rating for commercial and industrial power distribution
• 2-pole design for multi-conductor circuit protection
• THKM8 molded case circuit breaker construction
• Thermal magnetic trip unit for overload and short-circuit protection
• Interchangeable trip unit design
• Internal common trip mechanism for coordinated pole operation
• Bolt-on mounting for secure installation
• HACR rated for applicable HVAC and refrigeration systems
• Includes load-side lugs
• Suitable for switchboards, panelboards, and distribution equipment
• Built for long-term use in demanding electrical environments
  

Technical Specifications

• Part Number: THKMA826300
  
• Type: THKM8
  
• Poles: 2
  
• Amperage Rating: 300A
  
• Mounting Style: Bolt-On
  
• Trip Unit: Thermal Magnetic, Interchangeable
  
• Trip Configuration: Internal Common Trip
  
• A.I.C. Rating @ 240VAC: 65kA
  
• A.I.C. Rating @ 480VAC: 35kA
  
• A.I.C. Rating @ 600VAC: 25kA
  
• HACR Rated: Yes
  
• Included Accessories: Load-Side Lugs
  
• Dimensions:
  • Height: 15.5 in.
  • Width: 8.25 in.
  • Depth: 5.5 in.

Material Compliance and Certifications

• HACR Rated
• Manufactured for commercial and industrial electrical distribution applications
• Designed in accordance with applicable molded case circuit breaker industry requirements
• Always verify installation requirements and local electrical code compliance for your specific application
  

Where It Works Best

• The THKMA826300 is frequently used in:
• Commercial buildings
• Industrial facilities
• Manufacturing plants
• Electrical distribution systems
• Switchboards and panelboards
• HVAC and refrigeration equipment
• Equipment feeders and power distribution circuits
• Maintenance and replacement projects requiring a compatible THKM8-series breaker
• Whether you're maintaining an existing electrical system or replacing a breaker with matching ratings and configuration, the THKMA826300 provides a dependable form, fit, and functional solution for a wide range of power distribution applications.