Square D QO170 - 70 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

Square D QO170 is a 70A, 120V, 1-pole plug-in molded case circuit breaker designed to safeguard branch circuits in panelboards and load centers. Its fast plug-in connection lets you install or replace the unit with minimal panel downtime, making maintenance and upgrades straightforward for both professionals and handy homeowners.

Why this breaker stands out

• Effortless plug-in installation — secure, snap-in mounting that slides into a compatible QO panelboard or load center without specialized tools.
• Thermal-magnetic protection you can rely on — a trip unit that combines precise thermal sensing with rapid magnetic response to handle overloads and short circuits consistently across diverse environments.
• OEM-compatible fit — engineered to align perfectly with matching Square D QO OEM panelboards, ensuring reliable operation and seamless integration.
• Versatile for multiple settings — ideal for residential, commercial, and light industrial circuits where dependable 70-amp protection at 120 volts is needed.
• Single-pole convenience with scalable protection — protects one branch circuit while offering a clear path to expand protection as your electrical system grows.

What problems does it solve?

The QO170 delivers predictable, repeatable protection against overcurrent and short circuits, helping to prevent wiring damage, nuisance tripping, and downtime. The plug-in design minimizes installation time during new builds, service upgrades, or panel replacements, so you can keep electrical projects on schedule.

Who is this for?

Ideal for electricians and DO-IT-YOURSELF enthusiasts working with Square D QO family panels, this breaker suits homes undergoing remodels, small commercial spaces, and light industrial applications that require reliable 70A protection at 120V.

Technical snapshot

• Manufacturer: Square D
• Part number: QO170
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 70A
• Voltage rating: 120V
• Number of poles: 1
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

For dependable branch protection that installs quickly and fits seamlessly within Square D panelboards, the QO170 is a practical, proven choice. Use it where reliable, plug-in protection is required and compatibility with OEM load centers is a priority.