Square D QOB3100 - 100 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Square D QOB3100 is a 100-amp, 240-volt, 3-pole bolt-on molded case circuit breaker engineered to protect electrical systems in panelboards and load centers. Built for dependable branch circuit overcurrent and short-circuit protection, this unit delivers consistent performance in real-world installations.

• Secure bolt-on mounting: a rigid, vibration-resistant bus connection that stays tight under dynamic loads, helping maintain reliable protection over time.
• Thermal-magnetic trip unit: combines thermal and magnetic elements for stable, repeatable protection—opening reliably on sustained overloads and instantaneous short-circuits.
• OEM-compatible: designed to work seamlessly with matching Square D OEM load centers and panelboards for straightforward replacements and coordinated protection schemes.
• Versatile applications: suitable for residential, commercial, and light industrial environments where dependable branch circuit protection is required.

Technical specifications

• Manufacturer: Square D
• Part Number: QOB3100
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this 3-pole bolt-on breaker stands out: it’s built to integrate with Square D panelboards and load centers, delivering a reliable, coordinated protection solution for multi-phase circuits. The bolt-on design reduces connection loose ends and vibration-related wear, while the thermal-magnetic trip ensures protection remains consistent across varying loads and conditions. This makes the QOB3100 an ideal choice for new installations, panelboard upgrades, or replacements in residential subpanels, light commercial setups, and small industrial applications where safety and reliability matter most.

Practical use and tips

• Best suited for panelboards and load centers that require a 100 A, 240 V, 3-pole, bolt-on molded case breaker.
• Verify compatibility with your specific Square D OEM enclosure to ensure seamless fit and coordinated protection.
• When installing, follow manufacturer torque specifications for bolt-on mounting to maintain a secure, vibration-resistant connection.
• Use as part of a balanced protection strategy to reduce nuisance trips and protect downstream equipment from overcurrent and short circuits.