Square D QOB330EPD - 30 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB330EPD is a 30A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. Built for reliability in demanding environments, this breaker combines a secure mounting method with precise, repeatable protection performance.

• Secure bolt-on mounting: provides a rigid, vibration-resistant bus connection that stays firmly seated, minimizing movement and maintaining consistent electrical continuity in panel assemblies.
• Thermal-magnetic trip unit: merges thermal overload protection with instantaneous magnetic short-circuit protection, delivering stable trip characteristics across temperature variations and load changes.
• OEM-compatible design: engineered to fit and operate with matching Square D load centers and panelboards, ensuring correct fit, coordinated trip curves, and straightforward replacement—no guesswork for installers.
• Three-pole, 240V, 30A: ideal for protecting 3-phase branch circuits in commercial and light industrial panels, while also suited for residential electrical setups that require robust 240V protection.
• Versatile application: a reliable choice for panel upgrades, service entrances, and new installations where dependable overcurrent and short-circuit protection are essential.

Technical specs at a glance

• Manufacturer: Square D
• Part Number: QOB330EPD
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker stands out: it’s built to deliver predictable protection when it matters most. The bolt-on design reduces installation time and increases mechanical stability in panels undergoing vibration or movement, such as in busy service rooms or equipment closets. The thermal-magnetic trip ensures no nuisance trips under normal load while providing immediate response to dangerous short circuits, helping protect wiring, devices, and people. With OEM compatibility, you gain confidence that the replacement will integrate seamlessly with your existing Square D panelboard lineup, maintaining electrical safety standards and code compliance.

Ideal for electricians, facility managers, and maintainers who value durable, easy-to-integrate protection for 3-phase systems, the Square D QOB330EPD is a smart choice for reliable, long-lasting circuit protection in residential, commercial, and light industrial applications.