Square D EJB34100 - 100 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D EJB34100 is a rugged 100 A, 480 V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to endure the demands of commercial, industrial, and mixed-use spaces, this unit combines robust mounting with precise protection to keep electrical systems running smoothly.

Why this breaker stands out

• Secure bolt-on mounting: provides a rigid, vibration-resistant bus connection for long-term reliability in demanding environments.
• Thermal-magnetic trip unit: delivers stable, repeatable protection by accurately responding to overloads and short circuits, reducing nuisance trips.
• OEM-compatible design: engineered to work with matching Square D OEM load centers and panelboards, ensuring a seamless fit and predictable electrical performance.

Ideal for

• Residential, commercial, and light industrial applications where reliable three-phase protection is needed.
• Panelboard and load center retrofits or new installations that require 480 V three-pole protection with a secure bolt-on mount.
• Situations with vibration or movement where a sturdy bus connection helps prevent loosening over time.

Technical specifications

• Manufacturer: Square D
• Part Number: EJB34100
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Voltage Rating: 480 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical guidance and considerations

Pair this breaker with compatible OEM load centers and panelboards to maintain electrical performance and code compliance. In installations where 480 V three-phase service is standard, the EJB34100 provides a compact, reliable solution for protecting motor loads, feeders, and downstream circuits. Regularly verify mounting integrity and ensure the panel’s rating matches the breaker's 480 V specification to avoid incompatibilities.

Available from AmpState, the Square D EJB34100 delivers authentic, factory-approved protection for your electrical system. If you’re updating an existing installation or planning a new build, this 3-pole bolt-on breaker offers a proven combination of durability, precise protection, and compatibility with existing Square D panelboards.