Square D QOB350EPD - 120 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Square D QOB350EPD delivers dependable branch-circuit overcurrent and short-circuit protection for 120V panelboards and load centers. This 3-pole, bolt-on molded-case circuit breaker combines rugged construction with precise trip technology to keep critical circuits safe and running in demanding environments.

Why this 3-pole bolt-on breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection for consistent electrical contact and reduced risk of nuisance trips.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to overloads and short circuits across varying temperatures.
• OEM-compatible design is tuned to partner with matching Square D OEM load centers and panelboards, ensuring proper fit, coordination, and reliability.
• 3-pole configuration for 120V systems ideal for residential, commercial, and light industrial applications requiring full multi-pole protection on 3-phase or multi-wire circuits.

Technical specifications at a glance

• Manufacturer: Square D
• Part Number: QOB350EPD
• Type: Thermal-magnetic molded case circuit breaker
• Voltage Rating: 120V
• Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal applications and use cases

Choose this model for panelboards and load centers that require robust 3-pole protection at 120V. It’s well-suited for:

• Commercial electrical rooms feeding 3-wire or 3-phase equipment
• Upgrades or replacements in existing Square D installations to restore OEM-grade protection
• 120V branch circuits in lighting panels, small motors, HVAC controls, and other common electrical loads

Installation and compatibility

This QOB bolt-on breaker is designed to mount securely on compatible Square D panel rails and works best with matching OEM load centers and panelboards. When selecting this model, confirm that your enclosure is rated for 120V, 3-pole bolton breakers and that the QOB form factor aligns with your panel’s design. Proper mounting and alignment promote long-term reliability and consistent protection across your electrical system.

Why shop Square D with AmpState

AmpState offers genuine Square D QOB350EPD components, backed by authentic parts and reliable support. With fast availability and OEM-grade protection, you can trust this 120V, 3-pole bolt-on breaker to keep your panel and connected circuits safe and compliant.