Square D QOB320GFI - 20 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB320GFI is a dependable 20A, 240V, 3-pole bolt-on molded case circuit breaker designed to safeguard your electrical system from overcurrent and short circuits. Engineered for use in panelboards and load centers, it delivers stable, repeatable protection across a range of commercial, residential, and light industrial applications.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection for lasting reliability in demanding environments.
• Thermal-magnetic trip unit ensures fast, predictable response to both sustained overloads and short circuits, minimizing nuisance trips while protecting downstream circuits.
• Three-pole, 240V configuration suited for 3-phase systems or 240V branch circuits, expanding compatibility with modern panelboards and industrial setups.
• 20A rating offers flexible protection for lighting, receptacles, small machinery, and other common loads without unnecessary voltage drop or tripping.
• OEM-ready compatibility designed to integrate with matching Square D panelboards and load centers, streamlining installation and future upgrades.
• Versatile for multiple sectors ideal for residential upgrades, small commercial installations, and light industrial applications where reliable protection matters.

Ideal use cases

Use the QOB320GFI to protect branch circuits within Square D panelboards and load centers that require a 3-pole, 240V solution. It’s well-suited for equipment and circuits in homes, small offices, retail spaces, and light manufacturing environments where stable overcurrent protection and robust mounting are priorities.

Technical snapshot

• Manufacturer: Square D
• Part number: QOB320GFI
• 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

Practical guidance for installation and use

Choose this breaker when your panelboard specifies a bolt-on, 3-pole 240V solution with reliable thermal-magnetic protection. Ensure compatibility with your OEM load center and follow the manufacturer’s installation instructions for mounting and wiring. The bolt-on design simplifies a secure connection, while the trip unit provides predictable performance across varying loads and temperatures.

What problems it helps solve

• Prevents damage from overcurrent conditions on 240V circuits, reducing the risk of overheating and fire hazards.
• Provides dependable short-circuit protection to safeguard downstream devices and wiring.
• Delivers consistent protection in environments with vibration or equipment-start surges, thanks to its rigid bolt-on bus connection.

For professionals seeking a reliable, OEM-compatible 3-pole 240V solution with solid mounting and proven protection, the Square D QOB320GFI stands out as a thoughtful, long-lasting choice that aligns with real-world wiring needs and panelboard design.