Square D EJB24090 - 90 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Upgrade your electrical protection with the Square D EJB24090 90A, 480V, 2-Pole Bolt-On Molded Case Circuit Breaker — a durable, family-approved solution designed to guard branch circuits in panelboards and load centers. Built for dependable overcurrent and short-circuit protection, this breaker combines rugged mounting with precise, repeatable trip performance for demanding electrical environments.

• Secure bolt-on mounting — a rigid, vibration-resistant bus connection that stays put, even in equipment with heavy loads or challenging wiring layouts.
• Thermal-magnetic trip unit — delivers stable, repeatable protection by responding appropriately to both overcurrent and short-circuit conditions, reducing nuisance trips while safeguarding downstream equipment.
• OEM-compatible design — specifically engineered to work with matching Square D OEM load centers and panelboards, ensuring a seamless fit and reliable protection across compatible installations.
• Versatile applications — suitable for residential, commercial, and light industrial settings, making it a practical choice for new builds, panel upgrades, or service replacements.

Technical snapshot

• Manufacturer: Square D
• Part Number: EJB24090
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90A
• Voltage Rating: 480V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Why this 2-Pole bolt-on breaker stands out

When you need reliable protection for mid-to-large branch circuits, a 2-pole design like the EJB24090 provides coordinated switching for two hot legs in 480V systems. The bolt-on mounting delivers a solid mechanical connection, reducing the risk of connection loosening due to vibration or routing constraints. The thermal-magnetic trip mechanism offers predictable response times, helping you avoid nuisance trips while ensuring fast isolation during fault events. And because it’s designed to be compatible with Square D OEM panels, you’ll benefit from a streamlined installation process and consistent performance across your distribution hardware.

Ideal use cases and scenarios

• New installations in panelboards and load centers that require a 90A, 480V, 2-pole bolt-on breaker.
• Upgrading or replacing aging protection devices in commercial electrical rooms or light industrial spaces.
• Panel upgrades where OEM compatibility ensures long-term reliability and simplified maintenance.
• Applications demanding robust protection for critical motors and feeders in 480V systems.

Practical tips for installation and lasting performance

• Verify panelboard compatibility with Square D EJB series components to ensure a trouble-free fit.
• Follow manufacturer wiring diagrams and torque specifications for the bolt-on mounting to maintain the vibration-resistant connection.
• Consider coordination with upstream protective devices to optimize protection curves and minimize nuisance trips.
• Design your electrical layout with adequate clearance and ventilation around the breaker to maintain stable operation in varied temperatures.

Choose the Square D EJB24090 for dependable, OEM-aligned protection that keeps critical circuits safeguarded in diverse environments. Its combination of secure mounting, reliable thermal-magnetic protection, and broad compatibility makes it a pragmatic choice for professionals who value consistent performance and straightforward compatibility in residential, commercial, and light industrial panel installations.