EJB34030 - 30 Amp Circuit Breaker

EJB34030 - 30 Amp Circuit Breaker

The Square D EJB34030 is a 30 Amp, 3-pole circuit breaker used in compatible Square D NF panelboards. It's commonly selected when you're replacing an existing E-Frame breaker or maintaining a panel that already uses this style. Matching the original breaker helps preserve the panel's layout and keeps the installation straightforward.

Inside the breaker is a thermal-magnetic trip unit that protects against both overloads and short circuits. The thermal element responds to sustained overcurrent conditions, while the magnetic element reacts quickly when a fault occurs. A built-in trip indicator makes it easy to tell when the breaker has opened because of a fault, which can save time during maintenance and troubleshooting.

Key Features and Benefits

• 30 Amp current rating for three-phase branch circuit protection
• Three-pole configuration for commercial and industrial power systems
• Bolt-on mounting for compatible Square D NF panelboards
• Thermal-magnetic trip unit protects against overloads and short circuits
• Built-in trip indicator allows faster troubleshooting
• Rated for systems up to 480Y/277V AC
• Interrupting capacity up to 100 kA at applicable voltage ratings
• HACR rated for qualifying HVAC applications
• HID rated for qualifying high-intensity discharge lighting applications
• Accepts both copper and aluminum conductors
• Calibrated for operation at 40°C (104°F)
• Maintains the original fit and layout of compatible E-Frame panelboards

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB34030
  
• Series: 125A Frame EDB / EGB / EJB
  
• Device Short Name: EJB
  
• Frame Type: E-Frame
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Current Rating: 30 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
  
• Trip Unit Rating: 875 Amps
  
• Holding Current: 270 Amps
  
• Interrupting Ratings:
  • 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:
  • Copper: AWG 14–6
  • Aluminum: AWG 12–6
• Terminal Type: Aluminum Lugs
  
• Tightening Torque: 30.09 lb-in (3.4 N·m)
  
• 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: Approximately 4 lb
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Square D EJB34030 is cULus Listed, HACR-rated, HID-rated, and TAA-compliant. 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. Installation should be performed by qualified electrical personnel in accordance with the National Electrical Code (NEC), applicable local electrical codes, and all required safety standards.

Where It Works Best

• Square D NF panelboards
• Three-phase branch circuits
• Commercial electrical distribution systems
• Office buildings
• Manufacturing facilities
• Warehouses and distribution centers
• Healthcare facilities
• Educational campuses
• Retail stores and shopping centers
• HVAC equipment requiring HACR-rated protection
• High-intensity discharge (HID) lighting systems
• Electrical maintenance, retrofit, and replacement projects requiring a bolt-on E-Frame circuit breaker