Square D QOB115AFI - 15 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB115AFI is a dependable, single-pole bolt-on circuit breaker designed to protect branch circuits in panelboards and load centers. With a 15-amp rating at 120 volts, this molded-case breaker delivers targeted overcurrent and short-circuit protection for residential, commercial, and light industrial applications. Built for durability, its bolt-on mounting provides a rigid, vibration-resistant connection that helps maintain consistent electrical contact over time.

• Secure bolt-on mounting ensures a solid, vibration-resistant bus connection for reliable performance in demanding environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection, reducing nuisance trips while quickly responding to short circuits.
• OEM-ready compatibility works with matching Square D load centers and panelboards, simplifying replacement and retrofit projects.
• 1-pole, 15A, 120V configuration ideal for protecting individual branch circuits within standard single-phase electrical systems.

Technical snapshot

• Manufacturer: Square D
• Part Number: QOB115AFI
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 15A
• Voltage: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

This breaker is an excellent choice when you need precise, dependable protection for circuits such as lighting runs, outlets, or small equipment in a panelboard or load center. By pairing the QOB115AFI with its matching OEM enclosure, you get a cohesive protection solution that’s easier to install and less prone to compatibility issues compared with off-brand substitutes.

Who should consider the Square D QOB115AFI? Electricians tackling panel upgrades, homeowners performing DIY electrical work with proper safety practices, and technicians supporting commercial or light industrial installations where space is at a premium and reliable protection is essential. It’s especially well-suited for projects that require quick, secure bolt-on mounting and a consistent thermal-magnetic response for predictable circuit behavior.

Practical tips for use

• Confirm the panelboard or load center accepts bolt-on, single-pole breakers of this specification before installation.
• Ensure proper mechanical seating and tightness of the mounting bolts to maintain a solid electrical connection.
• Follow all applicable electrical codes and the panel’s instructions when replacing or upgrading breakers to maintain listed protection levels.
• Use as part of a balanced protection strategy across your distribution panel to reduce the risk of nuisance trips and ensure safe operation.