Square D QOB31001021 - 100 A, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB31001021 — a 100 A, 3-pole bolt-on molded-case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for real-world reliability, this unit combines a secure bolt-on mounting with a thermal-magnetic trip mechanism to provide stable, repeatable protection across a range of residential, commercial, and light-industrial settings.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping maintain consistent electrical performance in panels that experience movement or vibration.
• Thermal-magnetic trip unit delivers precise, predictable protection—thermal element handles overloads while the magnetic element responds rapidly to short circuits for fast interruption.
• OEM compatibility is built in—designed to be compatible with matching Square D OEM load centers and panelboards for seamless replacement and optimum system performance.
• 100 A, 3-pole configuration fits three-phase or multi-wire environments, suitable for broader protective coverage in appropriate panel setups.
• Durable molded-case design engineered to withstand the demands of busy electrical environments while maintaining dependable protection.

Technical specifications

• Manufacturer: Square D
• Part number: QOB31001021
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 100 A
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker stands out

Designed for reliability in panelboards and load centers, the QOB31001021 delivers robust protection where it matters most. The bolt-on mounting isn’t just about a snug fit—it reduces vibration-induced wear and ensures a solid, long-lasting electrical connection. The dual-stage protection from the thermal-m magnetic trip unit means you’ll see fewer nuisance trips and more predictable behavior during overloads and short circuits. Plus, its OEM compatibility simplifies replacement and stocking, making upgrades or repairs smoother and faster.

Ideal use cases

• Residential panels needing a dependable, space-efficient 3-pole protection solution for three-phase or multi-wire circuits.
• Commercial panelboards and light-industrial installations where rugged mounting and consistent trip performance matter.
• Panelboard upgrades or replacements that require exact compatibility with Square D OEM environments.
• Service upgrades or additions that demand a solid, reliable 100 A protective device with fast short-circuit interruption.

Incorporating the Square D QOB31001021 into your electrical system means embracing a proven combination of secure installation, precise protection, and OEM-aligned compatibility. It’s a practical, long-lasting choice for safeguarding circuits while maintaining straightforward maintenance and replacements in your panelboard or load-center setup.