E43B040L - 40Amp Circuit Breaker

E43B040L - 40 Amp Circuit Breaker

The E43B040L molded case circuit breaker is designed to provide dependable circuit protection in electrical distribution systems where a 40-amp, 3-pole breaker is required. Built on the E43 frame, this breaker helps protect equipment and wiring from overloads and short circuits while maintaining compatibility with existing electrical panels and switchgear that require this specific form, fit, and function. With interrupting ratings of 18kA at 480VAC and 25kA at 240VAC, the E43B040L is suited for commercial and industrial installations operating within these voltage levels. The unit is HACR rated and calibrated for 40°C operation, making it suitable for HVAC-related circuits and general distribution applications. Line-side and load-side terminals are included, simplifying installation and ensuring proper connections within legacy electrical systems. Like many molded case breakers used in long-standing infrastructure, it was built to last and designed to meet the practical needs of electrical maintenance and replacement projects.

Key Features and Benefits

• 40 Amp Continuous Rating: Designed to provide consistent protection for circuits requiring a 40A breaker.
• 3-Pole Configuration: Supports three-phase electrical systems commonly found in commercial and industrial facilities.
• E43 Frame Compatibility: Matches the form and mounting configuration used in equipment designed for the E43 breaker frame.
• HACR Rated: Suitable for heating, air-conditioning, and refrigeration equipment circuits.
• Thermal-Magnetic Protection: Helps respond to both overload conditions and short circuits.
• Includes Line and Load Terminals: Connection points are included to support straightforward installation.
• Designed for Longevity: Molded case construction built for long-term use in electrical distribution systems.

Technical Specifications

• Part Number: E43B040L
  
• Breaker Type: Molded Case Circuit Breaker
  
• Frame Type: E43
  
• Poles: 3
  
• Amperage Rating: 40 Amps
  
• Interrupting Rating:
  • 18kA @ 480VAC
  • 25kA @ 240VAC
• Operating Temperature Calibration: 40°C
  
• HACR Rated: Yes
  
• Terminals: Line and load-side terminals included
  
• Approximate Shipping Weight: 3.0 lbs
  
• Approximate Shipping Height: 6.35 inches
  

Material Compliance and Certifications

• Compliance: The E43B040L circuit breaker is manufactured to meet established electrical safety and performance standards applicable to molded case circuit breakers used in commercial and industrial power distribution systems.
• HACR Certification: HACR certification confirms its suitability for circuits serving heating, air-conditioning, and refrigeration equipment.
• Industry Materials: Components and materials are designed to align with typical electrical industry compliance expectations for molded case circuit protection devices.
  

Where It Works Best

• The E43B040L 3-pole 40A circuit breaker is commonly used in facilities where maintaining compatibility with existing electrical equipment is important.
• Commercial buildings with three-phase power distribution
• Industrial control panels and machinery circuits
• HVAC systems requiring HACR-rated protection
• Electrical maintenance and replacement projects in legacy panelboards or switchgear
• Facilities requiring a breaker with E43 frame compatibility and specific interrupting ratings
• Its design allows it to serve as a form, fit, and functional replacement in systems originally configured for this breaker type, helping maintain proper circuit protection without altering the surrounding electrical infrastructure.