Square D QOU3100 - 100 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Square D QOU3100 — a 100 A, 240 V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Designed for residential, commercial, and light industrial environments, this unit combines rugged construction with precise protection to keep electrical systems safe and operational.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, minimizing looseness and arcing in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding appropriately to both sustained overloads and short circuits, helping prevent nuisance trips while safeguarding equipment.
• OEM-compatible design matches exactly with corresponding load centers and panelboards, simplifying replacements and upgrades without compatibility concerns.
• Three-pole, 240V configuration ideal for three-phase systems and multi-wire circuits common in commercial and light industrial applications.

Technical essentials

• Manufacturer: Square D
• Part Number: QOU3100
• 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

Ideal use cases

• Panelboards and load centers in new installations or upgrades where a reliable 3-pole, 100 A protection device is required.
• Residential, commercial, and light industrial electrical systems with three-phase needs or multi-wire branch circuits.
• Applications requiring a vibration-tolerant, secure connection in environments with equipment movement or mechanical stress.

Practical guidance and benefits

Choosing the QOU3100 means prioritizing reliability and compatibility. Its bolt-on design reduces the risk of loose connections in panels exposed to vibration or movement, while the thermal-magnetic trip keeps protective behavior predictable across varying load profiles. When paired with matching OEM load centers and panelboards, you can retrofit or expand existing systems with confidence, knowing the breaker will align with the panel’s electrical characteristics and protection coordination.

How it compares to alternatives

Compared to plug-in breakers, the bolt-on QOU3100 offers a more secure, vibration-resistant installation that’s well-suited for panels subject to movement or harsher conditions. Its thermal-magnetic trip unit provides a balanced approach to protection that minimizes nuisance trips on overloads while delivering fast response to short circuits, a practical advantage in busy commercial or light industrial settings.

For contractors and electrical professionals sourcing reliable, OEM-compatible protection for three-phase circuits, the Square D QOU3100 from AmpState delivers precise protection, durable mounting, and straightforward integration with compatible panelboards.