Square D QOB350VH - 50 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Square D QOB350VH is a 50A, 240V, 3-pole bolt-on molded case circuit breaker designed for dependable branch-circuit protection in panelboards and load centers. It combines rugged construction with precise protection for demanding electrical installations.

Key strengths that set this breaker apart:

• Bolt-on mounting delivers a secure, vibration-resistant bus connection, reducing movement and arcing risks in environments with equipment vibration or shifting loads.
• Thermal-magnetic trip unit provides stable overload protection plus rapid magnetic tripping for short circuits, helping protect downstream wiring and devices with consistent, repeatable performance.
• 3-pole design for 240V systems supports balanced protection across all phases, making it suitable for 3-phase panelboards and load centers commonly used in commercial and light industrial settings.
• 50A, 240V rating aligns with mid-range branch circuits, feeders, and distribution pathways that require reliable protection without unnecessary nuisance trips.
• OEM compatibility ensures straightforward replacement within matching Square D panelboards and load centers, simplifying sourcing and installation for service professionals.

Ideal use cases

• Residential service panels with multi-zone or subpanel feeder protection where a robust, fixed-mount breaker is preferred over plug-in styles.
• Commercial electrical rooms and light industrial panels requiring dependable branch circuit protection for 3-phase or 240V circuits.
• Load centers and panelboards that demand a secure, vibration-tolerant solution to maintain consistent protection during equipment operation.

What problems it solves

• Prevents nuisance trips by providing a reliable thermal element that responds predictably to overloads.
• Minimizes connection movement and potential bus-bar wear through a rigid bolt-on mounting approach.
• Offers a proven, compatible replacement option that fits OEM panelboards and load centers without compromising performance.

Specifications at a glance

• Manufacturer: Square D
• Part Number: QOB350VH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

For installers seeking a reliable, purpose-built solution that pairs solid mechanical mounting with precise electrical protection, the QOB350VH delivers durable performance in residential, commercial, and light industrial environments. It’s not just a breaker—it’s a dependable safeguard for your panelboard and load center infrastructure.