Square D QOB1201021 - 20 A, 1-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Square D QOB1201021 — a 20A, 1-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. From AmpState, this unit pairs rugged bolt-on mounting with a thermal-magnetic trip system to provide precise, repeatable protection that handles both overloads and short circuits.

Key Features that matter in the real world

• Bolt-on mounting creates a rigid, vibration-resistant connection to the panel bus, reducing the risk of heating, arcing, or loose seating over time.
• Thermal-magnetic trip unit combines a thermal element for gradual overload protection with a magnetic element for instantaneous response to high fault currents, minimizing nuisance trips while guarding every downstream circuit.
• 20A, 1-pole design is ideal for light loads, branch circuits, and dedicated circuits within residential, commercial, and light industrial applications.
• OEM-level compatibility works seamlessly with matching Square D OEM load centers and panelboards for straightforward replacement and upgrade projects.

Applications and real-world use cases

• New installations in residential panelboards where a compact, reliable 1-pole breaker is required for individual branch circuits.
• Panelboard upgrades or replacements in commercial spaces where predictable trip behavior helps prevent downstream equipment damage.
• Light industrial environments needing robust protection for small-diameter or non-motor load circuits without compromising panel integrity.
• OEM-matched assemblies where consistency across the protection scheme simplifies maintenance and parts stocking.

Why choose this QOB1201021 breaker

• Durable bolt-on design eliminates field-soldered connections and reduces install vibration, promoting long-term reliability in busy electrical panels.
• Thermal-magnetic protection offers stable, repeatable performance across temperature and current fluctuations, protecting both conductors and connected devices.
• Specifically rated for branch circuit overcurrent and short-circuit protection, ensuring fast, predictable responses to faults without compromising normal operation.
• Designed to align with Square D panelboards and load centers, enabling straightforward sourcing and maintenance for existing systems.

Technical specifications

• Manufacturer: Square D
• Part number: QOB1201021
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 20A
• Number of poles: 1
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

For electricians and facility managers, the Square D QOB1201021 represents a precise, durable choice for protecting circuits in a wide range of panel configurations. Its combination of secure mounting, robust protection, and OEM-compatible design helps ensure reliable operation and easier maintenance across residential, commercial, and light industrial environments.