EJB34050 - 50 Amp Circuit Breaker

EJB34050 - 50 Amp Circuit Breaker

The Square D EJB34050 is a 50 Amp, 3-pole E-Frame circuit breaker designed to deliver dependable protection for commercial and industrial electrical distribution systems. Built for use in compatible Square D NF panelboards, this bolt-on breaker helps safeguard equipment and circuits against overloads and short circuits using a proven thermal-magnetic trip unit. A built-in trip indicator makes it easier to identify when the breaker has operated, helping maintenance teams troubleshoot and restore service more efficiently. Whether you're replacing an existing breaker or maintaining a facility, the EJB34050 offers the performance, durability, and compatibility professionals expect from the Square D E-Frame product line.

Key Features and Benefits

• 50 Amp current rating
• Three-pole design for three-phase electrical systems
• Bolt-on mounting for secure installation in compatible Square D NF panelboards
• Thermal-magnetic trip technology provides dependable overload and short-circuit protection
• Built-in trip indicator allows quick identification of a tripped breaker
• Rated for systems up to 480Y/277V AC
• Interrupting capacity up to 100 kA at applicable voltages
• HACR and HID rated for HVAC and high-intensity discharge lighting applications
• Accepts both copper and aluminum conductors
• Calibrated for operation in ambient temperatures up to 40°C (104°F)
• Compatible with a variety of available field-installable accessories

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB34050
  
• Series: 125A Frame EDB / EGB / EJB
  
• Frame Type: E-Frame
  
• Current Rating: 50 Amps
  
• Number of Poles: 3
  
• Voltage Rating: 480Y/277V AC
  
• Mounting Style: Bolt-On
  
• Trip Unit Technology: Thermal-Magnetic
  
• Protection Type: Overload and Short Circuit
  
• Trip Unit Rating: 1800 A
  
• Holding Current: 630 A
  
• Interrupting Capacity:
  • 100 kA @ 120V AC
  • 100 kA @ 120/240V AC
  • 100 kA @ 240V AC
  • 65 kA @ 277V AC
  • 65 kA @ 480Y/277V AC
• Breaking Capacity Code: J
  
• Wire Size Compatibility:
  • Copper: AWG 14–2/0
  • Aluminum: AWG 12–2/0
• Terminal Type: Aluminum lugs
  
• Compatible Equipment: Square D NF Panelboards
  
• Dimensions:
  • Height: 5.66 in. H
  • Width: 2.94 in. W
  • Depth: 4.05 in. D
• Weight: Approximately 4 lbs.
  

Material Compliance and Certifications

The Square D EJB34050 is cULus Listed, HACR rated, HID rated, and TAA compliant, making it suitable for a wide range of commercial and institutional applications. It is factory calibrated for operation at 40°C (104°F) and manufactured to meet recognized electrical safety and performance standards. Always install and maintain this breaker according to applicable electrical codes and manufacturer recommendations.

Where It Works Best

• Square D NF panelboards
• Commercial office buildings
• Manufacturing facilities
• Healthcare facilities
• Schools and universities
• Warehouses and distribution centers
• Retail and mixed-use buildings
• HVAC equipment and mechanical systems
• High-intensity discharge (HID) lighting circuits
• Electrical maintenance, retrofit, and replacement projects