Square D QOU320 - 20 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Designed for dependable protection in electrical distribution, the Square D QOU320 is a 20A, 240V, 3-pole bolt-on molded case circuit breaker built to guard branch circuits against overcurrent and short circuits. The secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, reducing the risk of loose connections in demanding environments.

Why the QOU320 stands out

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection that stays aligned even in high-vibration settings.
• Thermal-magnetic trip unit provides stable, repeatable protection performance against both overloads and short circuits.
• 3-pole, 240V operation ideal for three-phase systems and ensuring consistent protection across all conductors.
• OEM compatibility designed to pair with matching Square D OEM load centers and panelboards for a seamless replacement or upgrade.
• Versatile applications suitable for residential, commercial, and light industrial electrical distributions.

Technical specifications

• Manufacturer: Square D
• Part Number: QOU320
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Upgrading or replacing breakers in panelboards and load centers where OEM compatibility matters for performance and warranty.
• Protecting individual branch circuits in residential and small to mid-size commercial installations.
• Applications in environments with equipment vibration or movement where a secure, bolt-on connection minimizes connection fatigue.
• Systems requiring reliable protection against both overloaded conductors and potential short circuits in 3-phase layouts.

Practical guidance and benefits

Choosing the QOU320 means prioritizing lasting reliability and straightforward maintenance. The combination of bolt-on mounting and a thermal-magnetic trip unit helps maintain consistent protection performance over time, even as electrical loads fluctuate. When paired with matching Square D OEM load centers and panelboards, it simplifies stocking, replacement, and service, reducing downtime and ensuring electrical protection remains aligned with the original design intent.

Whether you're wiring a new installation, performing a panel upgrade, or replacing an aging breaker, the Square D QOU320 delivers robust, code-compliant branch circuit protection for 20A circuits at 240V across three poles.