Square D EJB26125 - 125 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Square D EJB26125 is a 125 A, 600 V, 2-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for demanding electrical environments, it pairs robust mechanical mounting with precise electrical protection to keep critical circuits safe and reliable.

Why this breaker stands out

• Secure bolt-on mounting creates a rigid, vibration-resistant connection to the bus, reducing movement under equipment vibration and ensuring consistent electrical contact.
• Thermal-magnetic trip unit provides stable, repeatable protection across temperature variations and load conditions, helping prevent nuisance trips while still catching true faults.
• 2-pole design protects both hot legs simultaneously, ideal for 120/240 V circuits and balanced protection in multi-wire branch circuits.
• OEM-compatible is designed to work with matching Square D OEM load centers and panelboards, simplifying replacements, upgrades, and panel maintenance.
• 125 A / 600 V rating handles substantial branch circuit loads while maintaining reliable protection for residential, commercial, and light industrial applications.

Who this is for

• Electrical professionals wiring or upgrading panelboards and load centers in homes, offices, retail spaces, and light industrial facilities.
• Technicians performing circuit protection upgrades where a rugged bolt-on solution is preferred for high-vibration or demanding environments.
• Maintenance teams seeking compatible, long-lasting replacements that align with OEM equipment without sacrificing performance.

Technical snapshot

• Manufacturer: Square D
• Part Number: EJB26125
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125 A
• Voltage Rating: 600 V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases and tips

Use this breaker to protect subpanels feeding heavy loads such as commercial lighting, HVAC controls, or feeders to machinery in light industrial settings. Its bolt-on design makes it a solid choice for panels where vibration resistance and secure bus connections are priorities. When integrating into a panel, verify compatibility with the specific OEM load center and follow the manufacturer’s torque and installation guidelines to ensure a proper, safe fit.

Key benefits at a glance

• Reliable protection for high-demand branch circuits
• Durable, vibration-resistant mounting
• Consistent performance across temperature ranges
• Seamless compatibility with matching OEM panels