Square D QOB335 - 35 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB335—a compact, reliable 35A, 240V, 3-pole bolt-on molded case circuit breaker designed for dependable protection in panelboards and load centers. With a rugged bolt-on mounting, it delivers a solid, vibration-resistant bus connection that stands up to busy electrical environments.

Precision protection you can trust

• Bolt-on mounting provides a secure, vibration-resistant connection to the panel bus, reducing looseness and improving long-term reliability.
• Thermal-magnetic trip unit delivers stable, repeatable protection by reacting to both overloads (thermal) and short circuits (magnetic)—helping prevent nuisance trips and equipment damage.
• Three-pole, 240V configuration protects three-phase circuits or multi-wire systems commonly found in commercial and light industrial settings.
• 35A rating tailored for branch circuits that require firm protection without unnecessary outages.
• OEM compatibility designed to pair with matching Square D load centers and panelboards for a seamless, code-compliant installation.
• Versatile application suitable for residential, commercial, and light industrial panels, offering flexibility as your electrical needs evolve.

Technical snapshot

• Manufacturer: Square D
• Part Number: QOB335
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 35A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

The Square D QOB335 is ideal when you need reliable protection for 3-phase feeders or complex panel layouts. Use it to shield branch circuits in commercial panelboards, retrofit older installations, or support light industrial control panels where a robust bolt-on breaker helps maintain wiring integrity and minimize arc-flash risk. Because it’s designed to match Square D OEM load centers, installation stays clean, code-compliant, and straightforward.

In practice, this breaker helps you prevent costly outages by quickly disconnecting circuits when overcurrent or short conditions occur, while its thermal-magnetic design minimizes nuisance trips during normal inrush events. For technicians and facilities teams, it’s a dependable upgrade that integrates smoothly into existing Square D ecosystems.