EJB24080 - 80 Amp Circuit Breaker

EJB24080 - 80 Amp Circuit Breaker

If you're replacing an existing breaker in a Square D NF panelboard, the EJB24080 is built for exactly that job. This 80 Amp, two-pole E-Frame circuit breaker installs with a bolt-on connection and matches the electrical characteristics commonly found in commercial lighting panelboards.

You'll typically see this breaker protecting 480Y/277V AC branch circuits in offices, schools, retail buildings, manufacturing facilities, and other commercial properties. Since it's part of the Square D EJB family, it fits compatible NF panelboards without changing the layout of the panel or requiring modifications during replacement. That's one reason it's a common choice during maintenance work and panel repairs.

Key Features and Benefits

• 80 Amp two-pole circuit breaker for Square D NF panelboards
• Bolt-on design provides a secure installation
• Thermal magnetic trip protects against overloads and short circuits
• Rated for 480Y/277V AC electrical systems
• Interrupting capacity up to 100 kAIC on qualifying voltage ratings
• Built-in trip indicator simplifies troubleshooting
• HACR rated for approved HVAC applications
• Compatible with copper and aluminum conductors
• Ideal for replacement and maintenance of existing E-Frame installations
• Maintains the original fit and layout of compatible NF panelboards

Technical Specifications

• Catalog Number: EJB24080
  
• Product Type: Thermal Magnetic Circuit Breaker
  
• Series: E-Frame (EJB)
  
• Frame Size: 125 Amp Frame
  
• Amperage Rating: 80 Amps
  
• Maximum Operating Voltage: 480Y/277V AC
  
• Number of Poles: 2
  
• Mounting Style: Bolt-On
  
• Panel Compatibility: Square D NF Panelboards
  
• Trip Unit Technology: Thermal Magnetic
  
• Protection Type: Overload and Short Circuit
  
• Trip Indicator: Yes
  
• Holding Current: 1000 Amps
  
• Trip Unit Rating: 2300 Amps
  
• Breaking Capacity:
  • 100 kAIC @ 120V AC
  • 100 kAIC @ 120/240V AC
  • 100 kAIC @ 240V AC
  • 65 kAIC @ 277V AC
  • 65 kAIC @ 480Y/277V AC
• Wire Size:
  • Copper: AWG 14–2/0
  • Aluminum: AWG 12–2/0
• Terminal Type: Aluminum Lugs
  
• Tightening Torque:
  • 34.5 lb-in (AWG 14–10)
  • 49.6 lb-in (AWG 8–2/0)
• Number of Spaces Required: 2
  
• Calibration Temperature: 40°C (104°F)
  
• Dimensions:
  • Height: 5.66 in
  • Width: 1.96 in
  • Depth: 4.05 in
• Weight: 3.0 lb
  

Material Compliance and Certifications

The EJB24080 is cULus listed, HACR rated, and TAA compliant. It is calibrated for operation at an ambient temperature of 40°C (104°F) and is intended for installation in compatible Square D NF panelboards. Installation should always be performed by qualified electrical personnel in accordance with the National Electrical Code (NEC), local regulations, and all applicable electrical safety requirements.

Where It Works Best

• Commercial lighting panelboards
• 480Y/277V AC branch circuits
• Office buildings
• Schools and universities
• Healthcare facilities
• Manufacturing and industrial buildings
• HVAC equipment requiring HACR-rated circuit protection
• Electrical maintenance and replacement projects
• Commercial applications requiring dependable two-pole overload and short-circuit protection