Square D EJB14030 - 30 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Designed by Square D for dependable branch circuit protection, the EJB14030 is a 30A, 277V, 1-pole bolt-on molded case circuit breaker built to safeguard panelboards and load centers. Its rugged bolt-on mounting delivers a rigid, vibration-resistant connection, ensuring reliable performance in demanding electrical environments.

• Secure bolt-on mounting: creates a solid bus connection that stays tight and steady through years of operation, reducing resistance changes from vibration or thermal cycling.
• Thermal-magnetic trip unit: combines a thermal element for gradual overload protection with a magnetic trigger for fast response to short circuits, delivering stable and repeatable protection profiles.
• OEM compatibility: engineered to pair with matching Square D load centers and panelboards, simplifying installation, replacements, and future panel upgrades.
• 277V single-pole design: ideal for commercial and light industrial applications, including lighting feeders and other 277V branch circuits where consistent protection is essential.

Technical snapshot

• Manufacturer: Square D
• Part Number: EJB14030
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who benefits from this breaker? facilities and installers working with 277V electrical feeds in commercial settings, offices, retail spaces, and light industrial environments where reliable, repeatable protection is critical. If you’re upgrading a panelboard or replacing a damaged breaker in a Square D installation, the EJB14030 provides OEM-aligned performance and a straightforward bolt-on installation.

Practical impact: - You get a secure, vibration-resistant connection that maintains consistent electrical contact over time. - The dual-stage protection of the thermal-magnetic trip unit minimizes nuisance trips while delivering rapid fault interruption when needed. - Real-world compatibility reduces integration risk and supports smooth maintenance and future panel expansions.

Tip: Always confirm panelboard compatibility and adhere to local electrical codes. Engage a licensed electrician for installation and testing to ensure safe, compliant operation.