Square D QOU330 - 30 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Overview

The Square D QOU330 is a purpose-built 3-pole, 30 A, 240 V bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. From AmpState, this breaker combines rugged mechanical integrity with precise electrical protection, making it an ideal choice for residential, commercial, and light industrial applications.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, reducing movement and arcing risks in busy panel environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining a thermal overload sensor with a magnetic short-circuit trip for fast response to faults.
• 3-pole design supports multi-phase systems, ensuring synchronized protection across all phases in 3‑phase panelboards.
• OEM compatibility is built to match Square D’s loadcenters and panelboards, making replacements and upgrades straightforward.
• Versatile application—suitable for residential, commercial, and light industrial installations that require reliable branch circuit overcurrent and short-circuit protection.

Technical specifications at a glance

• Manufacturer: Square D
• Part number: QOU330
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 30 A
• Voltage rating: 240 V
• Number of poles: 3
• Mounting style: Bolt-on
• Primary application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Apply the QOU330 in panelboards or loadcenters where a robust, three-pole protective device is required. Its bolt-on design makes it a reliable option for installations where vibration dampening and secure electrical connections are critical—such as panels in homes with heavy equipment, small-to-medium commercial setups, or light industrial service panels. It’s especially well-suited for scenarios where OEM compatibility with existing Square D infrastructure ensures a seamless upgrade or replacement.

Installation and compatibility tips

For installers and facility managers, the QOU330 offers a straightforward path to dependable protection. Ensure the panelboard or loadcenter is designed for bolt-on molded case breakers and that the QOU330’s 30 A, 240 V specifications align with the circuit requirements. When replacing an older unit, the compatible OEM design minimizes alignment or fitment issues, reducing downtime during upgrades or service calls. As with all electrical work, follow applicable safety standards and manufacturer guidelines during installation.

What makes AmpState’s Square D QOU330 a smart choice

Choosing the QOU330 means balancing solid electrical protection with practical installation benefits. The combination of a secure bolt-on mounting, a thermal-magnetic trip mechanism for reliable fault detection, and guaranteed compatibility with matching Square D loadcenters and panelboards translates into fewer compatibility headaches and faster commissioning. Whether you’re stocking spare breakers for routine maintenance or outfitting a new panel, this 3-pole 30 A solution delivers trusted performance across a range of environments.