Square D QOB2401021 - 40 A, 2-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB2401021 — a dependable, bolt-on molded case circuit breaker engineered to shield your electrical systems with precision. Designed for reliable branch circuit overcurrent and short-circuit protection, this 40A, 2-pole unit is a smart upgrade for panelboards and loadcenters that demand rock-solid performance and durable construction.

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, reducing arcing risk and maintaining consistent protection in demanding environments.
• Thermal-magnetic trip unit provides stable, repeatable protection by precisely responding to both overloads and short circuits, helping to prevent nuisance tripping while safeguarding wiring and devices.
• OEM-compatible design is tuned to work seamlessly with matching Square D loadcenters and panelboards, simplifying replacement and upgrade projects.
• Versatile for multiple settings ideal for residential panels, commercial electrical rooms, and light industrial installations where dependable circuit protection matters.
• 2-pole, 40A configuration targets two energized conductors, offering effective protection for circuits that require coordinated, dual-line interruption.

Why this breaker stands out

Unlike generic replacements, the QOB2401021 is built to integrate with Square D’s ecosystem, ensuring compatibility, reliability, and consistent performance with your existing equipment. The bolt-on mounting paired with a robust riser-free bus connection minimizes movement and wear over time, which translates to fewer service calls and longer-lasting protection.

Use cases and installation scenarios

• Upgrading a residential main or sub-panel where a dependable 40A, 2-pole breaker is required.
• Retrofitting small commercial panels that demand precise thermal-magnetic protection for lighting, plugs, and small equipment circuits.
• Replacements in loadcenters where OEM compatibility reduces installation headaches and ensures maximum protection performance.

Technical specifications at a glance

• Manufacturer: Square D
• Part Number: QOB2401021
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical considerations and tips

When selecting this breaker, verify your panelboard or loadcenter is compatible with Square D QOB-series devices. For installations, follow the applicable electrical codes and manufacturer data sheets to ensure proper torque on the bolt-on connection and secure seating within the panel. This unit pairs well with residential, commercial, and light industrial circuits that require dependable protection without frequent tripping or play in the connection.

With the Square D QOB2401021, you gain a reliable, purpose-built solution that protects your electrical system while delivering straightforward replacement and durable performance in a variety of environments.