EJB34020 - 20 Amp Circuit Breaker

EJB34020 - 20 Amp Circuit Breaker

The Square D EJB34020 is a 20 Amp, 3-pole E-Frame circuit breaker built to provide dependable protection for electrical systems installed in compatible Square D NF panelboards. Whether you're replacing an existing breaker or completing a new installation, this bolt-on model is designed to deliver consistent performance in commercial and industrial environments. Its thermal-magnetic trip unit responds to everyday overload conditions while reacting almost instantly to short circuits, helping protect connected equipment and minimize the risk of electrical damage.

Key Features and Benefits

• 20 Amp current rating for three-phase branch circuit protection
• Three-pole design for commercial and industrial power distribution
• Bolt-on mounting for secure installation in compatible Square D NF panelboards
• Thermal-magnetic trip unit provides protection against overloads and short circuits
• Built-in trip indicator simplifies fault identification and maintenance
• Rated for systems up to 480Y/277V AC
• Interrupting ratings up to 100 kA on applicable voltage systems

Technical Specifications

• Manufacturer: Square D
  
• Catalog Number: EJB34020
  
• Series: 125A Frame EDB / EGB / EJB
  
• Device Short Name: EJB
  
• Frame Type: E-Frame
  
• Product Type: Thermal-Magnetic Circuit Breaker
  
• Current Rating: 20 Amps
  
• Trip Unit Rating: 875 Amps
  
• Holding Current: 270 Amps
  
• Number of 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
  
• Circuit Breaker Applications: HACR Rated, HID Rated
  
• 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)
  
• 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
  
• Country of Origin: Mexico
  

Material Compliance and Certifications

The Square D EJB34020 is cULus Listed, HACR rated, HID rated, and TAA compliant, meeting recognized North American standards for electrical safety and performance. It is calibrated for operation at an ambient temperature of 40°C (104°F) and is intended for installation in compatible Square D NF panelboards. Installation should always be performed by qualified electrical personnel in accordance with the National Electrical Code (NEC), local electrical codes, and all applicable safety requirements.

Where It Works Best

• Square D NF panelboards
• Commercial electrical distribution systems
• Industrial facilities
• Office buildings
• Healthcare facilities
• Educational campuses
• Retail stores and shopping centers
• Warehouses and distribution centers
• Manufacturing plants
• Three-phase branch circuits