Square D QO320 - 20 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Square D QO320 is a 20-amp, 240-volt, 3-pole plug-in molded case circuit breaker designed to guard every branch circuit in panelboards and load centers. Built for dependable overcurrent and short-circuit protection, this unit snaps into place with a fast plug-in connection for streamlined installation and quick replacement, minimizing downtime during service or upgrades.

• Plug-in design for fast service — simplifies installation and maintenance by snapping into the panel bus without complicated wiring or tools.
• 3-pole, 240V, 20A — tailored for three-wire circuits and small three-phase or multi-line loads, ideal for commercial and light industrial environments as well as select residential setups.
• Thermal-magnetic trip unit — combines precise thermal protection with immediate magnetic response to short circuits, delivering stable and repeatable protection across diverse loads.
• OEM panel compatibility — engineered to fit with matching Square D OEM load centers and panelboards, ensuring reliable performance and straightforward inventory management.
• Versatile application — suitable for protecting branch circuits in panelboards and load centers across residential, commercial, and light industrial applications.

Technical snapshot

• Manufacturer: Square D
• Part Number: QO320
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Designed to deliver predictable protection in everyday electrical work, the Square D QO320 helps electricians and facility managers protect wiring, components, and equipment with confidence. Its plug-in convenience, robust thermal-magnetic trip, and OEM-compatible fit make it a practical choice for dependable, maintenance-friendly circuit protection in a wide range of installations.