E42B040 - 40Amp Circuit Breaker

E42B040 - 40Amp Circuit Breaker

Finding the right replacement circuit breaker is about more than matching an amp rating—it’s about maintaining compatibility with your existing electrical system. The E42B040 molded case circuit breaker is a 40 amp, 2-pole bolt-on breaker designed for applications that require the electrical ratings, physical dimensions, and mounting style of the E42 series.

Whether you're servicing a commercial facility, supporting industrial equipment, or maintaining an HVAC system, this breaker provides the overcurrent protection needed to help keep electrical systems operating as intended. Its bolt-on design creates a secure connection within compatible panels, while the included load-side terminals can help streamline installation and replacement work.

The E42B040 is HACR rated, making it suitable for qualifying heating, ventilation, air conditioning, and refrigeration applications. With interrupting ratings of 25kA at 240VAC and 18kA at 480VAC, it is designed for systems that require these specific fault-current capacities. Rated for operation in ambient temperatures up to 40°C (104°F), this molded case circuit breaker is built to last and remains a dependable choice for maintaining existing electrical infrastructure.

Key Features and Benefits

• 40 amp current rating for compatible electrical distribution systems
• 2-pole configuration for dual-pole circuit protection
• Bolt-on mounting design for secure installation
• Molded case construction for commercial and industrial applications
• Includes load-side terminals
• HACR rated for qualifying HVAC and refrigeration equipment
• Rated for operation in ambient temperatures up to 40°C (104°F)
• Interrupting capacity of 25kA at 240VAC and 18kA at 480VAC
• Designed to maintain the original form, fit, and function of compatible equipment
• Built to last in demanding electrical environments

Technical Specifications

• Part Number: E42B040
  
• Type: E42
  
• Circuit Breaker Type: Molded Case Circuit Breaker
  
• Mounting Style: Bolt-On
  
• Amperage: 40 Amps
  
• Poles: 2
  
• A.I.C. Rating: 25kA @ 240VAC; 18kA @ 480VAC
  
• Temperature Rating: 40°C (104°F)
  
• HACR Rated: Yes
  
• Included Terminals: Load-Side Terminals
  
• Width: 2.0 in.
  
• Height: 6.35 in.
  
• Depth: 3.92 in.
  
• Dimensions: 2.0"W x 6.35"H x 3.92"D
  
• Approximate Ship Weight: 4.31 lbs.
  

Material Compliance and Certifications

• HACR rated for qualifying HVAC and refrigeration applications
• Molded case circuit breaker construction
• Designed for use in systems requiring the published electrical ratings and configuration
• Intended for installation in accordance with applicable electrical codes and manufacturer requirements

Where It Works Best

The E42B040 is commonly found in commercial buildings, industrial facilities, manufacturing environments, HVAC systems, electrical distribution equipment, and maintenance projects where a 40 amp, 2-pole bolt-on molded case circuit breaker is required.