EJB24040 - 40 Amp Circuit Breaker

EJB24040 - 40 Amp Circuit Breaker

The Square D EJB24040 is a 40 Amp, 2-pole E-Frame circuit breaker built for use in compatible Square D NF panelboards. Designed with a thermal-magnetic trip mechanism, it helps protect your electrical systems from overloads and short circuits while providing dependable performance in commercial and industrial applications. Its bolt-on design creates a secure installation, and the built-in trip indicator makes it easy to see when the breaker has opened because of a fault. Rated for 480Y/277 VAC systems and offering interrupting capacities of up to 100 kA at applicable voltages, the EJB24040 is a solid choice for facilities where reliable circuit protection is a priority.

Key Features and Benefits

• 40 Amp, 2-pole E-Frame circuit breaker
• Designed for compatible Square D NF panelboards
• Bolt-on mounting for a secure fit
• Thermal-magnetic trip unit protects against overloads and short circuits
• Built-in trip indicator allows quick status checks
• Rated for operation up to 480Y/277 VAC
• Interrupting ratings up to 100 kA, depending on system voltage
• Compatible with copper and aluminum conductors
• HACR and HID rated
• Calibrated for operation at 40°C (104°F)

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB24040
  
• Series: EDB / EGB / EJB 125 A Frame
  
• Product Type: E-Frame Miniature Circuit Breaker
  
• Amperage: 40 Amps
  
• Poles: 2
  
• Maximum Voltage: 480Y/277 VAC
  
• Mounting Type: Bolt-On
  
• Trip Unit: Thermal-Magnetic
  
• Protection: Overload and Short Circuit
  
• Interrupting Ratings:
  • 100 kA @ 120 VAC
  • 100 kA @ 120/240 VAC
  • 100 kA @ 240 VAC
  • 65 kA @ 277 VAC
  • 65 kA @ 480Y/277 VAC
• Trip Rating: 1800 A
  
• Holding Current: 630 A
  
• Wire Range:
  • Copper: 14 AWG–2/0 AWG
  • Aluminum: 12 AWG–2/0 AWG
• Electrical Connection: Aluminum lugs
  
• Dimensions:
  • Height: 5.66 in. H
  • Width: 1.96 in. W
  • Depth: 4.05 in. D
• Weight: 3 lbs. (1.4 kg)
  
• Operating Temperature: 104°F (40°C)
  

Material Compliance and Certifications

The Square D EJB24040 is cULus Listed, TAA Compliant, and carries HACR and HID ratings. It is manufactured to meet recognized North American safety standards for use in compatible Square D NF panelboards.

Where It Works Best

The EJB24040 is a good fit for commercial and industrial electrical systems that use compatible NF panelboards. It's commonly used to protect lighting circuits, HVAC equipment, and branch circuits in offices, schools, healthcare facilities, retail buildings, warehouses, and manufacturing plants.