Square D QOB390VH - 90 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB390VH — a robust 90A, 240V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. Its secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, helping maintain reliable protection even in environments with equipment movement.

• Secure bolt-on mounting: a rigid, vibration-resistant connection to the bus for long-term, dependable performance.
• Thermal-magnetic trip unit: combines temperature-triggered and magnetic trip technology for stable, repeatable protection against overloads and short circuits.
• OEM-compatible: designed to integrate with matching Square D OEM load centers and panelboards for a seamless, code-compliant installation.
• Versatile applications: ideal for residential, commercial, and light industrial electrical systems that require reliable 90A, 240V protection.
• Core specs at a glance: 3-pole, bolt-on mounting, 90A, 240V — perfect for safeguarding branch circuits from overcurrent and short circuits.

Use cases that benefit from the QOB390VH include panel upgrades in homes, small commercial installations, and light industrial feeders where consistent protection is non-negotiable. The bolt-on design simplifies installation on standard bus bars, reducing the risk of loose connections and ensuring a solid, lasting fit. With its thermal-magnetic trip mechanism, you get predictable response times and fewer nuisance trips, while quickly disconnecting during high-energy faults to protect wiring and devices downstream.

Why this model stands out

The QOB390VH is purpose-built for reliability in environments that demand solid, code-compliant protection. By pairing a robust mechanical mounting approach with a proven trip method, it delivers a clear, durable solution for branch circuit protection across residential, commercial, and light industrial panels. When you choose this 3-pole bolt-on breaker, you’re investing in a protective device that aligns with Square D’s panel ecosystems and provides dependable performance for critical electrical distributions.

Technical snapshot:

• Manufacturer: Square D
• Part Number: QOB390VH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection