Square D QOB120VH - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB120VH delivers dependable branch-circuit protection in a compact, bolt-on molded case design. With a 20A, 120V, 1-pole configuration, this breaker is built to protect electrical systems in panelboards and loadcenters while maintaining solid performance across residential, commercial, and light industrial environments.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection for reliable operation in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both overload currents and short-circuit events, helping prevent nuisance trips and equipment damage.
• OEM-compatible design ensures smooth integration with matching Square D load centers and panelboards for seamless electrical protection across your system.
• Versatile application ideal for residential panels, commercial spaces, and light industrial circuits requiring dependable overcurrent and short-circuit protection.

Technical snapshot

• Manufacturer: Square D
• Part number: QOB120VH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 20A
• Voltage rating: 120V
• Number of poles: 1
• Mounting style: Bolt-on
• Primary purpose: Branch circuit overcurrent and short-circuit protection

Who benefits from the QOB120VH

contractors and electricians selecting a reliable, easy-to-install protection device for new panel builds or upgrades will appreciate the bolt-on design that minimizes loose connections and vibration risks. Homeowners upgrading a panel or servicing a commercial space with tight electrical schedules will value the precise thermal-magnetic trip that shields wiring and devices from intermittent faults. In both scenarios, this breaker helps ensure safer, more consistent electrical performance with minimal downtime.

Why this matters in real-world use

Compared to other breakers, the QOB120VH’s bolt-on mounting creates a sturdier connection to the bus, reducing the chance of connection drift in environments with vibration or movement. The thermal-magnetic trip unit provides a two-tier protection mechanism: the thermal element handles gradual overcurrent conditions, while the magnetic element rapidly trips during short circuits. That combination translates to faster fault interruption and improved protection for downstream equipment and wiring insulation.

Practical tips for optimal use

• Pair with compatible OEM load centers and panelboards to ensure guaranteed fit and electrical performance.
• Verify panel labeling reflects the 20A rating and 1-pole configuration to avoid misapplication.
• When replacing older breakers, confirm bolt-on mounting compatibility with the panel’s bus bars to maintain a secure, vibration-resistant connection.
• Keep clear documentation on the installation for maintenance checks and future upgrades.

Upgrade your electrical protection with the Square D QOB120VH — a focused, reliable solution for targeted branch-circuit safety in a wide range of settings. Order with confidence for consistent protection that’s designed to last in everyday service.