EJB34070 - 70 Amp Circuit Breaker

EJB34070 - 70 Amp Circuit Breaker

The Square D EJB34070 is a 70 Amp, 3-pole circuit breaker used in compatible Square D NF panelboards. It's most often selected when you're replacing an existing E-Frame breaker with the same amperage and configuration, helping keep the original panel setup unchanged. Matching the correct breaker type is especially important in existing installations, and this model is built to fit directly into NF panelboards that use the EJB series.

Inside, the breaker uses a thermal-magnetic trip unit to respond to both overloads and short circuits during normal operation. It also includes a trip indicator, making it easy to see when the breaker has opened because of a fault instead of being switched off manually. For electricians and maintenance teams, that's a simple feature that can save time when tracking down the cause of an outage.

Key Features and Benefits

• 70 Amp current rating
• Three-pole breaker for three-phase electrical systems
• Bolt-on mounting for compatible Square D NF panelboards
• Thermal-magnetic trip protection for overloads and short circuits
• Built-in trip indicator for easier troubleshooting
• Rated for 480Y/277V AC systems
• Interrupting capacity up to 100 kA at applicable voltage ratings
• HACR rated

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB34070
  
• Product Type: Thermal-magnetic circuit breaker
  
• Series: EDB / EGB / EJB 125A Frame
  
• Frame Type: E-Frame
  
• Amperage Rating: 70 Amps
  
• Voltage Rating: 480Y/277V AC
  
• Poles: 3
  
• Mounting Style: Bolt-On
  
• Protection: Overload and Short Circuit
  
• Trip Unit Rating: 1,800 A
  
• Holding Current: 630 A
  
• 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 Size:
  • Copper: AWG 14–2/0
  • Aluminum: AWG 12–2/0
• Terminal Type: Aluminum lugs
  
• Compatible Panelboards: Square D NF
  
• 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 EJB34070 is cULus Listed, HACR-rated, and TAA-compliant. It is calibrated for operation at 40°C (104°F) and intended for use in compatible Square D NF panelboards. Installation should be performed by qualified electrical personnel and in accordance with applicable electrical codes and manufacturer guidelines.

Where It Works Best

• Square D NF panelboards
• Three-phase branch circuits
• Commercial buildings
• Industrial facilities
• HVAC equipment requiring HACR-rated protection
• Warehouses and distribution centers
• Schools and universities
• Healthcare facilities
• Electrical maintenance and retrofit projects
• Replacement of existing EJB-series circuit breakers