Square D EJB34045 - 45 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D EJB34045 is a 45A, 480V, 3-pole bolt-on molded case circuit breaker designed to shield your electrical distribution system from overloads and short circuits. Built for dependable branch circuit protection in panelboards and load centers, it combines secure mounting, precise protection, and broad compatibility.

• Secure bolt-on mounting: a rigid, vibration-resistant bus connection reduces movement and loosening in demanding environments.
• Thermal-magnetic trip unit: combines thermal overload protection with magnetic instantaneous trip for fast, repeatable responses to faults.
• OEM compatibility: engineered to integrate with matching Square D OEM load centers and panelboards for a clean, reliable fit.
• Versatile application: suitable for residential, commercial, and light industrial distribution needs.

What this means in practice: you get a single, proven solution to protect feeders, branch circuits, and equipment from overcurrent and short circuits. The 3-pole configuration ensures balanced protection across all phases, which is crucial in three-phase panelboards and commercial installations.

Key specifications

• Manufacturer: Square D
• Part number: EJB34045
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 45 A
• Voltage rating: 480 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

Install the EJB34045 in panelboards and load centers that feed lighting, receptacle circuits, and modest motor loads where 480 V three-phase distribution is standard. Its secure mounting and reliable trip characteristics help minimize nuisance trips and ensure consistent protection when starting motors or HVAC equipment. Because it’s designed for OEM compatibility, you can swap in this breaker for a like-for-like replacement without modifying bus connections or panel architecture.