EJB34090 - 90 Amp Circuit Breaker

EJB34090 - 90 Amp Circuit Breaker

When you need a replacement breaker that matches the original equipment, the Square D EJB34090 is built to do exactly that. This 90 Amp, 3-pole E-Frame circuit breaker is designed for use in compatible Square D NF panelboards, delivering dependable protection against overloads and short circuits. Its thermal-magnetic trip unit responds to both long-term overcurrent conditions and instantaneous faults, helping protect branch circuits and connected equipment. A built-in trip indicator also makes it easy to tell when the breaker has tripped due to a fault instead of simply being switched off, saving time during inspections and troubleshooting.

Key Features and Benefits

• 90 Amp current rating
• Three-pole design for three-phase electrical systems
• Bolt-on installation for compatible Square D NF panelboards
• Thermal-magnetic trip unit protects against overloads and short circuits
• Built-in trip indicator simplifies fault identification
• Rated for 480Y/277V AC applications
• Up to 100 kA interrupting capacity at applicable voltage ratings
• HACR rated for qualifying HVAC equipment
• Compatible with copper and aluminum conductors
• Engineered for dependable long-term performance in commercial and industrial environments

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB34090
  
• Frame Type: E-Frame
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Amperage Rating: 90 Amps
  
• Voltage Rating: 480Y/277V AC
  
• Poles: 3
  
• Mounting Type: Bolt-On
  
• Compatible Panelboards: Square D NF Panelboards
  
• Trip Technology: Thermal-Magnetic
  
• Trip Rating: 2,300 A
  
• Holding Current: 1,000 A
  
• Protection: Overload and Short Circuit
  
• Interrupting Rating:
  • 100 kA @ 120V AC
  • 100 kA @ 120/240V AC
  • 100 kA @ 240V AC
  • 65 kA @ 277V AC
  • 65 kA @ 480Y/277V AC
• Wire Range:
  • Copper: AWG 14–2/0
  • Aluminum: AWG 12–2/0
• Terminal Type: Lugs
  
• Dimensions:
  • 5.66 in. × 2.94 in. × 4.05 in.
• Weight: Approximately 4 lbs.
  

Material Compliance and Certifications

The Square D EJB34090 is cULus Listed, HACR-rated, and TAA-compliant. It is calibrated for operation in ambient temperatures up to 40°C (104°F) and is manufactured for use in compatible Square D NF panelboards.

Where It Works Best

• Commercial office buildings
• Manufacturing facilities
• Warehouses and distribution centers
• Healthcare facilities
• Schools and universities
• Retail buildings
• HVAC equipment requiring HACR-rated protection
• Maintenance and retrofit projects involving compatible Square D NF panelboards