EJB24090 - 90 Amp Circuit Breaker

EJB24090 - 90 Amp Circuit Breaker

When you need dependable circuit protection for a compatible Square D NF panelboard, the Square D EJB24090 is a solid choice. This 90 Amp, 2-pole E-Frame circuit breaker is built for 480Y/277V AC electrical systems and provides thermal-magnetic protection against both overloads and short circuits. Its bolt-on design keeps the breaker securely mounted, making it well suited for replacement projects as well as new installations in commercial and industrial facilities.

Key Features and Benefits

• 90 Amp current rating
• Two-pole design
• Bolt-on installation for compatible Square D NF panelboards
• Thermal-magnetic trip unit protects against overloads and short circuits
• Built-in trip indicator simplifies troubleshooting
• Rated for up to 480Y/277V AC systems
• Interrupting ratings up to 100 kA on applicable voltage ratings
• HACR rated for qualifying HVAC applications
• Accepts both copper and aluminum conductors
• Designed for dependable performance in commercial and industrial electrical systems

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB24090
  
• Frame Type: E-Frame
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Amperage Rating: 90 Amps
  
• Number of Poles: 2
  
• Maximum Operating Voltage: 480Y/277V AC
  
• Mounting Style: Bolt-On
  
• Panel Compatibility: Square D NF Panelboards
  
• Trip Unit Technology: Thermal-Magnetic
  
• Protection: Overload and Short Circuit
  
• Trip Indicator: Yes
  
• Holding Current: 1000 Amps
  
• Trip Unit Rating: 2300 Amps
  
• Interrupting Rating:
  • 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 (3.9 N·m) for AWG 14–10
  • 49.6 lb-in (5.6 N·m) for AWG 8–2/0
• Number of Spaces Required: 2
  
• Calibration Temperature: 40°C (104°F)
  
• Dimensions:
  • Height: 5.66 in H
  • Width: 1.96 in W
  • Depth: 4.05 in D
• Weight: 3 lb
  

Material Compliance and Certifications

The Square D EJB24090 is cULus Listed and HACR rated. It is calibrated for operation in ambient temperatures up to 40°C (104°F) and is intended for installation in compatible Square D NF panelboards.

Where It Works Best

• Square D NF panelboards
• Commercial lighting panelboards
• 480Y/277V AC branch circuits
• Office buildings
• Schools and universities
• Healthcare facilities
• Retail buildings
• Manufacturing and industrial facilities
• HVAC and refrigeration equipment requiring HACR-rated circuit protection
• Electrical maintenance, repair, and panel upgrade projects
• Commercial applications requiring dependable two-pole overload and short-circuit protection