EJB34015 - 15 Amp Circuit Breaker

EJB34015 - 15 Amp Circuit Breaker

If you're replacing a breaker in a compatible Square D NF panelboard, the EJB34015 is designed to fit the job without changing the existing panel layout. This 15 Amp, 3-pole circuit breaker is commonly used on three-phase branch circuits where dependable overload and short-circuit protection are required.

Inside the breaker is a thermal-magnetic trip unit. The thermal element responds to overloads that develop over time, while the magnetic element reacts almost instantly when a short circuit occurs. That combination makes this style of breaker a common choice in commercial and industrial electrical systems where reliable circuit protection is part of everyday operation.

Key Features and Benefits

• 15 Amp current rating
• Three-pole design for three-phase branch circuits
• Bolt-on mounting for compatible Square D NF panelboards
• Thermal-magnetic trip unit protects against overloads and short circuits
• Built-in trip indicator for quicker troubleshooting
• Rated for systems up to 480Y/277V AC
• Interrupting ratings up to 100 kA on applicable voltage systems
• HACR rated for qualifying HVAC applications
• HID rated for high-intensity discharge lighting systems
• Compatible with copper and aluminum conductors
• Designed to maintain the original fit and layout of compatible NF panelboards

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB34015
  
• Series: EDB / EGB / EJB 125A Frame
  
• Device Short Name: EJB
  
• Frame Type: E-Frame
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Current Rating: 15 Amps
  
• Poles: 3
  
• 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: 270 Amps
  
• Trip Current: 875 Amps
  
• Breaking 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 Range:
  • Copper: AWG 14–6
  • Aluminum: AWG 12–6
• Terminal Type: Aluminum Lugs
  
• Tightening Torque: 30.09 lb-in (3.4 N·m) for AWG 14–6
  
• Number of Spaces Required: 3
  
• Calibration Temperature: 40°C (104°F)
  
• Dimensions:
  • Height: 5.66 in H
  • Width: 2.94 in W
  • Depth: 4.05 in D
• Weight: 4 lb
  

Material Compliance and Certifications

The Square D EJB34015 is cULus Listed, HACR rated, HID rated, and TAA compliant. It is intended for installation in compatible Square D NF panelboards and is calibrated for operation at an ambient temperature of 40°C (104°F). Installation should be performed by qualified electrical personnel and in accordance with the National Electrical Code (NEC), local regulations, and applicable electrical safety standards.

Where It Works Best

• Square D NF panelboards
• Three-phase branch circuits
• Commercial lighting panelboards
• 480Y/277V AC electrical distribution systems
• Office buildings
• Manufacturing facilities
• Schools and universities
• Healthcare facilities
• Retail buildings
• Warehouses and distribution centers
• HVAC equipment requiring HACR-rated protection
• HID lighting installations
• Electrical maintenance and replacement projects