Square D QOB3351021 35A 3P 240V Circuit Breaker, QO, Bolt-On | AmpState

Meet the Square D QOB3351021 — a 35 A, 3-pole, 240 V circuit breaker engineered for robust protection in panelboards, load centers, and electrical distribution systems. This QO bolt-on model delivers a secure, durable connection designed to stand up to the demands of commercial and industrial installations, making it an ideal choice for both new builds and retrofit projects.

Why this matters in real-world projects: when you’re replacing a breaker or building a spare stock, keeping the BOM aligned to the original part number minimizes compatibility surprises and speeds up maintenance. The QOB3351021 is built to fit compatible QO panelboards precisely, helping you preserve system protection without firmware-like guesswork.

Key features

• QO Bolt-On design: secure mounting in compatible panelboards and load centers for a reliable, vibration-resistant connection.
• Three-pole configuration: appropriate for 240 V three-phase circuits common in many commercial and light-industrial setups.
• 35 A rated: provides targeted overcurrent protection for feeders and branch circuits, helping prevent equipment damage and downtime.
• Brand and compatibility: Square D, a trusted name in electrical protection equipment, with a direct part number for easy identification (QOB3351021).
• Availability: stocked by AmpState to support efficient procurement and streamlined maintenance planning.

Use cases and benefits

This breaker is ideal for replacement projects where the original QO bolt-on breaker is specified, ensuring plug-and-play compatibility with existing panelboards. Keeping a spare QOB3351021 on hand reduces downtime during routine maintenance or unexpected faults. It protects 3-pole, 240 V circuits—such as main distribution paths and multi-phase loads—across commercial facilities, helping you maintain reliable power distribution with minimal disruption.

Compatibility and support

If you’re unsure about fit, AmpState offers guidance to confirm compatibility. Send a message to verify that the QOB3351021 matches your panelboard or to explore closely related Square D QO bolt-on options within the same family.

Specifications at a glance

• Manufacturer: Square D
• Product Type: Circuit Breaker
• Part Number: QOB3351021
• Amperage: 35 A
• Poles: 3
• Voltage: 240 V
• Mounting: QO Bolt-On
• Availability: AmpState