CMDL3800F w/ MES3800LSI - 800Amp Circuit Breaker

CMDL3800F w/ MES3800LSI - 800 Amp Circuit Breaker

The CMDL3800F circuit breaker with MES3800LSI trip unit is designed for dependable high-capacity protection in demanding electrical distribution systems. Built on the CMDL frame and rated at 800 amperes, this 3-pole thermal-magnetic breaker helps safeguard equipment and electrical infrastructure against overloads and short circuits in commercial and industrial installations. With an interchangeable trip unit and 100% rated performance at 40°C, it provides reliable protection in environments where full-load operation is expected. Its strong interrupting capacity—25kA at 600VAC, 50kA at 480VAC, and 65kA at 240VAC—supports critical power distribution systems that require consistent fault protection. The breaker is also HACR rated, making it suitable for heating, air conditioning, and refrigeration applications. Supplied with load terminals, this model offers straightforward installation for electrical professionals working with high-amperage systems.

Key Features and Benefits

• 800 Amp Continuous Protection – Designed for high-current electrical distribution applications requiring consistent and dependable circuit protection.
• 3-Pole Configuration – Ideal for three-phase power systems commonly used in commercial and industrial environments.
• MES3800LSI Trip Unit – Provides advanced protection with long-time, short-time, and instantaneous trip functions to help manage electrical faults effectively.
• 100% Rated at 40°C – Built to operate at full load without derating when installed in properly rated enclosures.
• High Interrupting Capacity – Rated for 25kA at 600VAC, 50kA at 480VAC, and 65kA at 240VAC, supporting safe interruption of high fault currents.
• Thermal-Magnetic Protection – Combines thermal overload protection with magnetic short-circuit response for dependable system safety.
• HACR Rated – Approved for use in heating, air conditioning, and refrigeration circuits.
• Interchangeable Trip Unit Design – Allows easier serviceability and flexibility when adapting protection settings.
• Includes Load Terminals – Simplifies installation and integration into electrical distribution systems.

Technical Specifications

• Part Number: CMDL3800F w/ MES3800LSI
  
• Amperage Rating: 800A
  
• Poles: 3
  
• Frame Type: CMDL
  
• Interrupting Rating (A.I.C.):
  • 25kA @ 600VAC
  • 50kA @ 480VAC
  • 65kA @ 240VAC
• Trip Unit: MES3800LSI
  
• Breaker Type: Thermal-Magnetic with interchangeable trip unit
  
• Temperature Rating: 100% rated at 40°C
  
• HACR Rating: Yes
  
• Included Accessories: Load terminals
  
• Approximate Shipping Dimensions: Height 16.0 in
  
• Shipping Weight: 8.25 lbs
  

Material Compliance and Certifications

• Industry Standards: This circuit breaker is manufactured using materials and construction methods intended to meet widely recognized electrical industry safety and performance standards for molded case circuit breakers.
• Code Compatibility: Components are engineered for compatibility with modern electrical distribution equipment and designed to support compliance with applicable electrical codes when installed by qualified professionals.
  

Where It Works Best

• Main or feeder protection in switchboards and panelboards
• Manufacturing and processing facilities with high-load equipment
• Data centers and large commercial buildings requiring stable power management
• HVAC and refrigeration systems due to HACR approval
• Heavy-duty electrical distribution systems that demand high interrupting capacity and consistent performance