E42B040L - 40Amp Circuit Breaker

E42B040L - 40 Amp Circuit Breaker

The E42B040L molded case circuit breaker is a 40-amp, 2-pole thermal-magnetic breaker designed for dependable circuit protection in commercial and industrial electrical distribution systems. Built on the E42 frame platform, this breaker provides protection against overloads and short circuits while maintaining compatibility with existing equipment designed for this frame type. With interrupting ratings of 18kA at 480VAC and 25kA at 240VAC, the E42B040L is suited for installations where reliable branch or feeder circuit protection is required.

This 40A HACR-rated molded case circuit breaker includes both line-side and load-side terminals, allowing for straightforward installation in compatible panels and switchgear. Rated for 40°C operation, the breaker is designed for environments where consistent electrical protection is essential for maintaining system stability. Its molded case construction supports long service life, making it a practical form-fit-function replacement for legacy systems that require an E42 frame 40-amp breaker.

Key Features and Benefits

• 40 Amp Current Rating – Provides dependable protection for branch circuits and feeder applications.
• 2-Pole Configuration – Designed for use in systems requiring dual-pole circuit protection.
• E42 Frame Compatibility – Matches systems designed for E42 frame molded case breakers.
• Thermal-Magnetic Trip Mechanism – Responds to both sustained overloads and instantaneous short-circuit conditions.
• HACR Rated – Suitable for heating, air conditioning, and refrigeration equipment circuits.
• Interrupting Capacity – Rated 18kA at 480VAC and 25kA at 240VAC for protection against fault currents.
• Included Terminals – Ships with both line and load-side terminals for installation.
• Built to Last – Molded case design intended for long service life in demanding electrical environments.
  

Technical Specifications

• Part Number: E42B040L
  
• Amperage Rating: 40 Amps
  
• Poles: 2
  
• Frame Type: E42
  
• Interrupting Rating:
  • 18kA @ 480VAC
  • 25kA @ 240VAC
• Frequency: 50/60 Hz
  
• Operating Temperature: 40°C
  
• Breaker Type: Molded Case Circuit Breaker
  
• HACR Rated: Yes
  
• Terminals: Line and Load Included
  
• Approximate Weight: 2.0 lbs
  
• Height: 6.35 in
  

Material Compliance and Certifications

• Industry Standards: The E42B040L circuit breaker is manufactured to meet applicable industry standards for molded case circuit breakers used in commercial and industrial power distribution systems.
• HACR Certification: HACR certification confirms suitability for heating, air conditioning, and refrigeration equipment circuits where required by code.
• Molded Insulating Case: The molded insulating case helps protect internal components while maintaining electrical isolation.
  

Where It Works Best

• Commercial electrical distribution panels
• Industrial control panels and equipment circuits
• HVAC and refrigeration systems requiring HACR-rated protection
• Manufacturing facilities and maintenance replacements
• Electrical systems requiring 18kA @ 480VAC fault interruption