Square D EGB14040 - 40 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Engineered for dependable branch-circuit protection, the Square D EGB14040 40A, 277V, 1-pole bolt-on molded case circuit breaker is a smart choice for panelboards and loadcenters that demand consistent performance in challenging environments. Its robust design features a secure bolt-on mounting that delivers a rigid, vibration-resistant bus connection, helping maintain reliable protection even in assemblies subject to movement or vibration.

Why this breaker stands out

• Secure bolt-on mounting ensures a tight, vibration-resistant connection to the bus, reducing the risk of loose contacts and intermittent trips.
• Thermal-magnetic trip unit provides stable, repeatable protection across temperature changes and load variations, helping prevent nuisance trips while keeping circuits safe during faults.
• OEM-compatible design aligns with matching Square D loadcenters and panelboards, simplifying integration and serviceability in existing electrical systems.
• Versatile application suitable for residential, commercial, and light industrial projects where reliable single-pole protection is needed for branch circuits.
• 277V operation makes it well-suited for commercial lighting and other 277V distribution scenarios common in office environments and small facilities.

Specifications at a glance

• Manufacturer: Square D
• Part number: EGB14040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 277V
• Number of poles: 1
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Use the EGB14040 in panelboards and loadcenters where single-pole protection is required for 40-amp circuits. It’s a practical choice for commercial spaces with 277V lighting circuits, small offices, retail environments, and light industrial facilities that rely on dependable, low-maintenance protection.

Practical considerations and tips

When installing, ensure compatibility with your existing Square D panelboard or loadcenter and follow manufacturer torque specifications for bolt-on mounts to maintain the integrity of the bus connection. Because it uses a thermal-magnetic trip mechanism, it’s designed to respond quickly to short-circuit faults while minimizing unnecessary trips due to normal temperature fluctuations. For ongoing reliability, pair this breaker with appropriate overcurrent protection plans that reflect your circuit loading and local electrical codes.

AmpState offers genuine Square D components, including the EGB14040, backed by performance you can trust for serviceable, long-term electrical protection in a variety of settings.