Square D QOB220 - 20 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB220 is a 20A, 240V, 2-pole bolt-on molded case circuit breaker designed for dependable branch circuit protection in panelboards and load centers. Its bolt-on mounting delivers a rigid, vibration-resistant connection, making it a trusted choice for installations where panel integrity matters as much as protection.

What makes the QOB220 unique

• Secure bolt-on mounting — creates a solid bus connection that stays tight through vibration and arcing, minimizing nuisance trips and improving long-term reliability.
• Thermal-magnetic trip unit — combines precise thermal overload protection with instantaneous magnetic trip for swift response to short circuits, delivering stable, repeatable protection characteristics.
• Exact compatibility — crafted to pair with matching OEM load centers and panelboards, ensuring seamless integration in standard electrical systems.
• Versatile 2-pole design — protects 240V circuits with simultaneous disconnection of both ungrounded conductors, enhancing safety in shared-neutral and multi-wire branch configurations.

Ideal for residential, commercial, and light industrial use

Whether you're wiring a home service panel, a small commercial distribution panel, or a light industrial control cabinet, the QOB220 delivers reliable branch circuit overcurrent and short-circuit protection. It’s especially well-suited for circuits that require robust protection in environments where vibration or movement might challenge less-secure mounting methods.

Practical use cases

• Subpanels in homes for dedicated 240V circuits like clothes dryers or certain HVAC components that fit a 20A load profile.
• Commercial load centers where compact, reliable protection is needed for lighting, receptacle banks, or small motor-driven equipment.
• Light industrial panels where vibration is a consideration and a secure bolt-on connection helps prevent connection loosening over time.

Technical specifications at a glance

• Manufacturer: Square D
• Part number: QOB220
• Amperage rating: 20A
• Voltage rating: 240V
• Number of poles: 2
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection

Choose the Square D QOB220 for a dependable, OEM-compatible solution that combines secure installation with precise protection. It’s a practical, long-term choice for safeguarding electrical systems across a range of residential, commercial, and light industrial applications.