Square D EJB16045 - 45 A, 347 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Square D EJB16045 45A, 347V, 1-Pole Bolt-On Circuit Breaker — a purpose-built solution for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Designed for professional electrical installations, this molded case breaker anchors your electrical system with a secure, vibration-resistant connection and precise protection performance.

What sets this breaker apart

• Secure bolt-on mounting ensures a rigid bus connection, reducing movement and wear in environments with vibration or frequent panel access.
• Thermal-magnetic trip unit delivers stable, repeatable protection by quickly reacting to overloads and short circuits, helping to prevent damage to downstream equipment.
• OEM compatibility is engineered to be compatible with matching Square D loadcenters and panelboards, facilitating straightforward integration without unnecessary adaptations.
• Versatile applications ideal for residential, commercial, and light industrial settings where reliable discrete-circuit protection is essential.

Technical snapshot

• Manufacturer: Square D
• Part Number: EJB16045
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45 A
• Voltage Rating: 347 V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

Use this breaker to protect branch circuits in commercial lighting panels fed from 347V systems, or to replace a legacy unit in a panelboard that requires a robust, single-pole, bolt-on solution. It’s well-suited for spaces where vibration is a factor—such as equipment rooms, mechanical spaces, and areas with active HVAC or pumps—where a secure connection helps maintain consistent protection over time. Whether you’re building out a new installation or upgrading existing infrastructure, this 45A unit provides dependable, code-compliant isolation for individual circuits.

Why choose this model from AmpState

As a trusted source for genuine OEM electrical components, AmpState ensures you receive authentic Square D hardware designed to work together seamlessly with your panelboards and loadcenters. The EJB16045 combines proven performance with straightforward installation, giving electricians and facility managers a reliable, long-term solution for protecting critical circuits.

Tips for installation and optimization

Before installation, confirm that your panelboard matches the EJB family requirements and that the bolt-on mounting pattern aligns with the bus arrangement. Use this unit for new builds or replacements where a single-pole, bolt-on molded case breaker is specified, and pair it with corresponding OEM devices to maintain system integrity and electrical performance over the life of the installation.