EJB24045 - 45 Amp Circuit Breaker

EJB24045 - 45 Amp Circuit Breaker

If you're replacing a breaker in a compatible Square D NF panelboard, the Square D EJB24045 is built for that job. This 45 Amp, 2-pole E-Frame circuit breaker uses a thermal-magnetic trip unit to protect circuits from overloads and short circuits while matching the form and fit of the original equipment. It accepts both copper and aluminum conductors, is calibrated for 40°C (104°F) operation, and is built to handle the demands of everyday service. Like many breakers from this product family, it's built to last when properly installed and used in compatible equipment.

Key Features and Benefits

• 45 Amp, 2-pole E-Frame miniature circuit breaker
• Designed for compatible Square D NF panelboards
• Bolt-on mounting for a secure installation
• Thermal-magnetic trip unit helps protect against overloads and short circuits
• Built-in trip indicator for quick fault identification
• Interrupting capacity up to 100 kA at applicable voltages
• Compatible with both copper and aluminum conductors
• HACR and HID rated
• Calibrated for operation in ambient temperatures up to 40°C (104°F)

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB24045
  
• Frame Series: 125 A Frame EDB / EGB / EJB
  
• Product Type: E-Frame Miniature Circuit Breaker
  
• Amperage Rating: 45 Amps
  
• Number of Poles: 2
  
• Mounting Type: Bolt-On
  
• Maximum Operating Voltage: 480Y/277 VAC
  
• Trip Technology: Thermal-Magnetic
  
• Protection: Overload and Short Circuit
  
• Trip Unit Rating: 1800 A
  
• Holding Current: 630 A
  
• Interrupting Ratings:
  • 100 kA @ 120 VAC
  • 100 kA @ 120/240 VAC
  • 100 kA @ 240 VAC
  • 65 kA @ 277 VAC
  • 65 kA @ 480Y/277 VAC
• Wire Compatibility:
  • Copper: AWG 14–2/0
  • Aluminum: AWG 12–2/0
• Connection Type: Lugs
  
• Dimensions:
  • Height: 5.66 in. H
  • Width: 1.96 in. W
  • Depth: 4.05 in. D
• Weight: 3 lb (1.4 kg)
  
• Operating Temperature: 104°F (40°C)
  

Material Compliance and Certifications

The Square D EJB24045 is cULus Listed, TAA Compliant, HACR rated, and UL Listed for High Intensity Discharge (HID) applications.

Where It Works Best

This breaker is commonly found in commercial buildings, schools, healthcare facilities, retail spaces, manufacturing plants, and office buildings that use compatible Square D NF panelboards. It's a practical replacement for existing branch circuits serving lighting, HVAC equipment, and general power distribution.