Square D QOB320VH - 20 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB320VH is a 20A, 240V, 3-pole bolt-on molded-case circuit breaker designed to protect your panelboard or load center from overcurrent and short-circuit events. Built for durable, long-term performance, this breaker delivers reliable protection for demanding electrical systems in a compact, easy-to-install package.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays put even in environments with vibration or movement.
• Thermal-magnetic trip unit combines a responsive thermal element for overload protection with a fast magnetic trip for short circuits, delivering stable, repeatable protection performance.
• OEM compatibility is designed to pair with matching Square D OEM load centers and panelboards, minimizing mismatch risks and simplifying stocking and maintenance.

Ideal applications

Designed for residential, commercial, and light industrial use, the QOB320VH is ideal for protecting 3-phase loads in panelboards and load centers. Use cases include safeguarding three-phase motors, HVAC equipment, pumps, compressors, and other critical branch circuits where reliable protection and a secure mounting method are essential.

Technical snapshot

• Manufacturer: Square D
• Part number: QOB320VH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 20A
• Voltage rating: 240V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical considerations and tips

• Choose the QOB320VH for panelboards and load centers that list bolt-on breakers in the QOB family to ensure compatibility and optimal performance.
• For installations that require secure performance in vibration-prone environments, the bolt-on design helps maintain a solid bus connection over time.
• Plan replacements or upgrades in spaces where three-pole protection is needed for 240V, three-phase loads, and verify that the panelboard rating accommodates this breaker type.
• Always follow local electrical codes and the panelboard manufacturer’s installation instructions when adding or replacing breakers.

Secure, reliable protection for your 3-phase circuits starts with the Square D QOB320VH. Available from AmpState, this genuine Square D component combines precise protection with OEM-accurate compatibility to keep your electrical system running smoothly.