Square D | QO340VH | Circuit Breaker | 3-Pole | 240V | 22kA | Plug-In

Square D QO340VH: 3-Pole 240V Plug-In Circuit Breaker

Designed for maintenance, retrofit, and replacement in compatible Square D panels, the QO340VH is a dependable plug-in circuit breaker that meets demanding electrical protection needs. With three poles, this unit reliably safeguards three-phase circuits at 240V, delivering robust performance where it matters most.

Crucial specifications at a glance

• Poles: 3-Pole
• Voltage: 240V
• Interrupting capacity: 22kA (at 240V)
• Mounting: Plug-In (designed for compatible QO panel boards)
• Part number: QO340VH

Why this breaker stands out

What sets the QO340VH apart is its combination of precise compatibility and strong fault protection. The three-pole configuration makes it ideal for safeguarding 3-phase equipment, motors, and balanced loads commonly found in commercial and light industrial settings. The 22kA interrupting rating provides a higher level of protection against short circuits, helping to minimize damage and downtime when a fault occurs.

Fit, compatibility, and installation considerations

Compatibility is the key here. This unit is purpose-built for use in Square D QO-series panel boards. Before you order, confirm fit and ratings to ensure seamless replacement and reliable operation. Remember: the part number is your best reference for compatibility, so verify QO340VH matches your panel's specifications and existing breaker style.

Ideal use cases

• Replacement for failed or aging 3-pole breakers in 240V, 3-phase systems
• Retrofit projects where existing equipment requires the QO plug-in format
• Maintenance upgrades to improve fault protection for motors and balanced loads

Practical tips for maximum reliability

• Ensure the compatible QO panel board is designed for plug-in breakers of this size and rating.
• Power down the service and follow lockout/tagout procedures before attempting replacement.
• Inspect the panel bus connections for cleanliness and corrosion prior to installation to prevent poor contact.
• Keep a spare QO340VH on hand for scheduled maintenance and quick replacements to minimize downtime.

What you gain with the QO340VH

Reliable, easy-to-install protection for three-phase circuits at 240V, with a strong fault-current rating that helps protect downstream equipment and wiring. Its plug-in design makes swaps straightforward in compatible panels, reducing service time and complexity during upgrades or replacements. If you’re equipment-focused, this breaker provides a precise fit for your existing QO controller ecosystem, aligned with the part number you’ll reference for compatibility.

Ready for retrofit, maintenance, or replacement projects, the Square D QO340VH delivers dependable, three-pole protection where every amp matters. Ensure you’ve matched the panel and ratings, and you’ll have a robust, plug-in solution built to protect your electrical system.