Square D QO320SWN1021 20A 3-Pole 240 V Circuit Breaker

Introducing the Square D QO320SWN1021 20A 3-Pole 240 V Circuit Breaker—a dependable protection device designed for 240-volt installations and three hot-leg circuits. As a genuine Square D component, this part number is a reliable replacement option for existing QO panelboards, delivering precise overcurrent protection for 20-amp loads.

Overview

Part number QO320SWN1021, this 20-amp, 3-pole breaker safeguards three conductors in 240 V service. It’s ideal for three-phase equipment or multi-wire branch circuits where uninterrupted protection across all hot legs is essential.

Key specifications

• Current rating: 20 A
• Poles: 3
• Voltage rating: 240 V
• Part number: QO320SWN1021
• Brand: Square D

Why this 3‑pole 240 V breaker stands out

• Dedicated protection for 3-wire, 240 V circuits: The 3-pole design interrupts all hot legs simultaneously, reducing the risk of dangerous feed-through during a fault.
• Genuine Square D compatibility: Specifically engineered to fit Square D QO panelboards, ensuring reliable mating with the bus and lugs and straightforward replacement when servicing legacy equipment.
• Ease of maintenance and upgrades: Using this like-for-like, 20 A protection device within existing QO infrastructure helps extend service life without rewiring.

Use cases

• Protects 240 V circuits feeding three-phase equipment or multi-wire branch circuits
• Ideal replacement part for Square D QO panelboards requiring a 20 A, 3-pole device
• Suitable for small motors, pumps, and general 240 V loads up to 20 A

Installation tips

• Ensure the panel is designed for QO-series breakers and that a 20 A, 3-pole, 240 V device is required for the circuit.
• Verify wiring corresponds to a three-pole, 240 V configuration and follow local electrical codes during installation.
• If replacing an existing unit, confirm the part number and rating to minimize downtime and ensure a proper match with your QO panel.