EJB14050 - 50 Amp Circuit Breaker

EJB14050 - 50 Amp Circuit Breaker

When dependable circuit protection matters, the Square D EJB14050 delivers the performance professionals expect. Designed for use in compatible Square D NF panelboards, this 50 Amp, 1-pole E-Frame miniature circuit breaker helps protect electrical systems from overloads and short circuits with a proven thermal-magnetic trip unit. Whether you're replacing a worn breaker during routine maintenance or maintaining an existing lighting panelboard, the EJB14050 provides the correct form, fit, and function for a straightforward installation.

Its bolt-on design creates a secure connection, while the built-in trip indicator makes it easy to see when the breaker has opened because of a fault, helping reduce troubleshooting time and get systems back online faster. Rated for 277 VAC applications, the EJB14050 offers a 100 kA interrupting rating at 120 VAC along with 65 kA interrupting ratings at 120/240 VAC, 240 VAC, and 277 VAC to help protect electrical equipment during fault conditions. It is also HACR, HID, and Switching Duty rated, making it well suited for lighting systems, HVAC equipment, and a variety of commercial branch circuits.

Key Features and Benefits

• 50 Amp, single-pole E-Frame miniature circuit breaker
• Designed for compatible Square D NF panelboards
• Thermal-magnetic trip unit provides overload and short-circuit protection
• Bolt-on mounting helps ensure a secure installation
• Built-in trip indicator allows quick visual identification after a trip
• Rated for systems up to 277 VAC
• HACR, HID, and Switching Duty rated
• Accepts copper conductors from 14–2/0 AWG and aluminum conductors from 12–2/0 AWG
• Calibrated for operation in ambient temperatures up to 40°C (104°F)
• Compatible with a variety of field-installable accessories
• Built to last for long-term service in compatible electrical systems

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB14050
  
• Product Type: Miniature Circuit Breaker
  
• Frame Type: E-Frame
  
• Series: 125A Frame EDB/EGB/EJB
  
• Amperage: 50 Amps
  
• Poles: 1
  
• Maximum Operating Voltage: 277 VAC
  
• Trip Unit Technology: Thermal-Magnetic
  
• Trip Unit Rating: 1,800 A
  
• Holding Current: 630 A
  
• Interrupting Ratings:
  • 100 kA @ 120 VAC
  • 65 kA @ 120/240 VAC
  • 65 kA @ 240 VAC
  • 65 kA @ 277 VAC
• Mounting Style: Bolt-On
  
• Compatible Panelboards: Square D NF
  
• Protection: Overload and Short Circuit
  
• Trip Indicator: Yes
  
• Electrical Connections: Aluminum lugs
  
• Wire Range:
  • Copper: 14–2/0 AWG
  • Aluminum: 12–2/0 AWG
• Tightening Torque:
  • 34.5 lbf-in (3.9 N·m) for AWG 14–10
  • 49.6 lbf-in (5.6 N·m) for AWG 8–2/0
• Dimensions:
  • Height: 5.66 in.
  • Width: 0.98 in.
  • Depth: 4.05 in.
• Weight: 2 lb.
  

Material Compliance and Certifications

• cULus Listed
• TAA Compliant
• HACR Rated
• HID Rated
• Switching Duty Rated
• Calibrated for operation at 40°C (104°F)
• Country of Origin: Mexico
• Manufacturer's 18-Month Warranty

Where It Works Best

The Square D EJB14050 is a practical choice for commercial, industrial, and institutional facilities that use compatible Square D NF panelboards. You'll commonly find it protecting lighting panelboards, HVAC equipment, branch circuits, and other 277 VAC electrical systems where dependable overload and short-circuit protection is essential.