Square D QOB340VH1021 40A 3P 240V Circuit Breaker, Bolt-On | AmpState

Meet the Square D QOB340VH1021 — a precise 40A, 3-pole, 240V bolt-on circuit breaker engineered to protect critical circuits within panelboards, load centers, and electrical distribution networks. When exact part-number compatibility matters, this unit is a deliberate, dependable choice that keeps your electrical system safe and up to code.

Key benefits and what sets it apart

• Exact fit for bolt-on installations. Designed for secure mounting in compatible Square D panels, delivering a robust, vibration-resistant connection that stays put in demanding environments.
• Direct part-number match. Part number QOB340VH1021 enables quick identification and streamlined inventory management for maintenance teams and panel builders.
• Rated 40 amps across 3 poles at 240V. Provides reliable overload protection for multi-wire branch circuits and shared neutrals in commercial and industrial setups.
• Versatile for distribution applications. Ideal for panelboards, load centers, and electrical distribution assemblies where precise protection and easy replacement matter most.
• Support when you need it. AmpState offers assistance to verify compatibility and fit, ensuring you have the right part for your specific panel configuration.

Why this matters in real-world use

In facilities where downtime is costly, having the exact replacement part reduces search time and eliminates guesswork. The QOB340VH1021 is purpose-built for Square D bolt-on environments, so technicians can perform swaps quickly without modifying enclosures or bus assemblies. It protects essential circuits—such as lighting, HVAC, or service feeders—while maintaining consistent electrical performance across shifts.

Use cases and ideal customers

• Maintenance technicians stocking spare parts for ongoing panelboard upkeep in commercial buildings, warehouses, or manufacturing floors.
• Panel builders selecting a verified, plug-in bolt-on breaker for client projects requiring a precise part match.
• Auditors and procurement teams tracking exact Series QOB components to simplify audits and warranties.

Compatibility and practical tips

• Compatible with panelboards and distribution systems designed for Square D QOB bolt-on breakers seeking a 40A, 3-pole, 240V configuration.
• Before installation, confirm the panel model accepts QOB bolt-on breakers and verify the mounting hardware is appropriate for your enclosure.
• Store spares in a cool, dry environment to preserve terminal integrity and trip performance.
• If you’re unsure about fit, message AmpState for quick compatibility checks and guidance on the exact panel requirements.

Secure the right protection for your electrical system with the Square D QOB340VH1021. A precise part-number match, reliable bolt-on installation, and 240V three-pole protection come together to keep circuits safe and downtime minimal. Ready to confirm fit or place an order? AmpState is here to help you verify compatibility and get the right part to your door.