Siemens BQD340 40A 3P 480V Circuit Breaker, Bolt-On | AmpState

Meet the Siemens BQD340 — a bolt-on circuit breaker designed for panelboards, load centers, and electrical distribution networks. With a precise 40 A rating, three poles, and 480 V capability, this unit delivers dependable overload protection in industrial and commercial settings. Available from AmpState, it’s the smart choice when a direct part-number match matters for maintenance, panel fabrication, and reliable spare inventory.

Key Features

• Bolt-On mounting for secure, vibration-resistant installation in compatible enclosures.
• Three-pole design supports balanced protection for 3‑phase circuits and simplifies wiring in complex panels.
• 40 A rating provides precise protection for feeders and branch circuits without unnecessary disconnection.
• 480 V operation aligns with standard industrial power distribution systems.
• Direct part-number match simplifies replacement scenarios and minimizes downtime.
• Siemens engineering delivers trusted performance and consistent trip characteristics in demanding environments.

Specifications at a Glance

• Manufacturer: Siemens
• Part Number: BQD340
• Product Type: Circuit Breaker
• Amperage: 40 A
• Poles: 3
• Voltage: 480 V
• Mounting: Bolt-On

Ideal Uses and Scenarios

• Maintenance teams needing a fast, direct match for existing BQD340 installations to minimize downtime during replacements.
• Panel builders integrating 3‑phase power distribution in commercial or light industrial facilities.
• Spare inventory for critical panels where having the exact part on hand reduces repair time and project delays.
• Retrofits or upgrades in 480 V three-phase systems where reliable protection and consistent trip characteristics are essential.

Why This Breaker Stands Out

Unlike generic replacements, the BQD340 is purpose-built for Siemens panel systems and 480 V three‑phase networks. Its bolt-on design provides a sturdy, vibration-resilient mount in demanding environments, while the 40 A rating delivers predictable performance without over- or under-tripping. For installers and end-users who require a precise, compatible fit, the BQD340 removes guesswork from sourcing and speeds up commissioning.

Compatibility & Support

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit. AmpState keeps a reliable stock of direct-match parts like the BQD340 so you can plan maintenance or expansion with confidence.

Practical Installation Tips

• Verify that your enclosure and distribution panels are rated for 480 V and 3‑phase operation before installation.
• Ensure electrical power is isolated and appropriate PPE is used during replacement or installation.
• Follow manufacturer installation instructions for bolt-on breakers to ensure a secure, code-compliant fit.
• Keep a spare BQD340 on hand in environments where 3‑phase distribution is common to minimize downtime during outages.