Square D QO330 - 30 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Square D QO330 is a 30A, 240V, 3-pole plug-in molded case circuit breaker built to shield your electrical system from overloads and short circuits. Designed for dependable branch circuit protection in panelboards and load centers, this unit makes installation and service remarkably straightforward, so you can keep power flowing safely and efficiently.

• Fast plug-in connection: Snap-in installation designed for quick setup and effortless replacement in compatible panelboards and load centers, minimizing downtime during upgrades or maintenance.
• Thermal-magnetic trip unit: Combines thermal overload protection with magnetic short-circuit protection to deliver stable, predictable performance across a range of conditions and loads.
• OEM-compatible reliability: Engineered to be compatible with matching Square D QO load centers and panelboards, ensuring seamless fit and dependable operation.
• Versatile across environments: Ideal for residential panels, commercial applications, and light industrial installations where compact, robust protection is essential.

Technical details

• Manufacturer: Square D
• Part Number: QO330
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 30A
• Voltage rating: 240V
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker meets real-world needs

When expanding or updating a panel, the QO330 provides a reliable three-phase protection point without sacrificing ease of service. The plug-in design reduces labor time during installation and replacement, which is especially valuable in commercial and light industrial settings where downtime matters. The thermal-magnetic trip mechanism delivers consistent protection against nuisance trips and sudden faults, helping protect wiring, devices, and connected loads.

Practical use scenarios

• Installing or upgrading a three-pole circuit in a 3-phase panelboard for commercial equipment or machinery.
• Replacing a failed breaker in a Square D QO-compatible load center with a like-for-like 30A protection solution.
• Expanding a small electrical system in a light industrial or multi-tenant building while preserving panelboard compatibility and safety margins.
• Retrofitting residential or commercial panels to ensure robust short-circuit protection for added circuits or new equipment.

Pair the Square D QO330 with a compatible QO load center or panelboard to ensure consistent performance and straightforward maintenance. If you’re protecting branch circuits in homes, offices, or light manufacturing spaces, this 30A, 240V, 3-pole plug-in breaker delivers precise protection with the convenience you need for reliable, long-term electrical safety.