Square D QOB290 - 90 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

AmpState presents the Square D QOB290 90A, 240V, 2-Pole Bolt-On Molded Case Circuit Breaker — a robust choice for dependable protection in today’s electrical panels. This unit is engineered to guard both wiring and connected equipment from overcurrent and short-circuit events, ensuring smooth, continuous operation in demanding environments.

Built for reliability in panelboards and load centers, this 2‑pole breaker features a secure bolt-on mounting that creates a rigid, vibration‑resistant bus connection. Its thermal‑magnetic trip unit provides stable, repeatable protection performance, responding quickly to short circuits while avoiding unnecessary trips on gradual overloads.

• Amperage rating: 90 A
• Voltage rating: 240 V
• Number of poles: 2
• Mounting style: Bolt-on
• Trip mechanism: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection
• Compatibility: Designed to be used with matching OEM load centers and panelboards

Why it matters: The bolt-on design delivers a rock-solid mechanical connection that stays secure in environments with vibration or movement—common in busy electrical rooms and equipment spaces. The thermal-magnetic trip unit delivers precise protection: fast enough to stop faults, yet selective enough to minimize nuisance trips, helping protect downstream devices and wiring.

Ideal use cases include:

• New installs or replacements in residential panelboards where a 90 A, 240 V solution is required
• Subpanels in small to mid-size commercial settings needing reliable feeder protection
• Light industrial enclosures where dependable fault protection and durable mounting are essential

Who should consider the QOB290: electricians, facilities managers, and maintenance teams who value compatibility with Square D OEM panels and load centers, predictable protection behavior, and a mounting method designed for long-term vibration resistance. This breaker helps standardize protection across multiple installations, reducing troubleshooting time and enhancing system uptime.

Practical guidance: Verify that your panelboard model is compatible with the QOB290, and follow standard electrical safety procedures during installation. With its 90 A rating and 240 V capacity, it’s a practical, reliable choice for mid-range distribution protections in both new builds and retrofit projects.