Square D EGB34040 - 40 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D EGB34040—a dependable 40A, 480V, 3-pole bolt-on molded case circuit breaker engineered to safeguard your panelboards and loadcenters from overcurrent and short-circuit events. Built for demanding environments, this unit delivers solid protection with a focus on durability and ease of installation.

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, helping maintain consistent electrical contact and reliable operation over time.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining thermal (overload) and magnetic (short-circuit) sensing for predictable trip behavior.
• Three-pole design for 3-phase systems and a 480V rating make it ideal for commercial and light industrial applications where balanced, phase-protected power is essential.
• OEM-compatible compatibility is designed to work with matching Square D OEM loadcenters and panelboards, ensuring a clean, proper fit and streamlined installation.
• Bolt-on ease-of-service simplifies replacement in existing enclosures, reducing downtime during maintenance or upgrades.

Why this breaker matters in real-world setups

In commercial spaces, small vibrations and frequent motor starts can stress electrical circuits. The EGB34040’s bolt-on mounting and robust bus connection help resist movement and ensure ongoing contact quality. The thermal-magnetic trip unit is tuned for stable coordination with other protection devices, helping you avoid nuisance trips while still delivering fast, decisive protection when faults occur. This breaker is a practical choice for installations where 3-phase power and 480V systems are standard—think panelboards serving offices, retail facilities, data rooms, and light industrial equipment.

Technical snapshot

• Manufacturer: Square D
• Part number: EGB34040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40 A
• Voltage rating: 480 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who should consider the Square D EGB34040

Ideal for electricians and facilities managers working with Square D panelboards and loadcenters in residential-adjacent commercial spaces, retail locations, and light industrial settings. If you need reliable 3-phase protection for 480V systems with a design that prioritizes secure mounting and predictable trip performance, this breaker is built to fit the bill.