Siemens BQD6340 - 40 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens BQD6340, a 40A, 600V, 3-pole bolt-on molded case circuit breaker designed to safeguard branch circuits in panelboards and load centers. Built for reliable protection in both new builds and upgrades, this unit delivers precise, dependable overcurrent and short-circuit protection across residential, commercial, and light industrial applications.

Why the Siemens BQD6340 stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping keep electrical connections solid in environments with movement or vibration.
• Thermal-magnetic trip unit offers stable, repeatable protection performance against both overloads and short circuits, reducing nuisance trips and enhancing safety.
• Three-pole design optimized for three-phase circuits and motor loads, paired with a 40A rating to handle common commercial and light industrial applications.
• 600V rating supports standard commercial and industrial wiring while maintaining robust insulation and protection margins.
• OEM-ready compatibility designed to work with matching Siemens OEM load centers and panelboards, ensuring a seamless replacement or upgrade path.
• Versatile installation suitable for residential panel upgrades, commercial service panels, and light industrial distribution where dependable branch-circuit protection is essential.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: BQD6340
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases and benefits

For installers and facility managers, the BQD6340 is an ideal choice when upgrading aging panels or configuring new commercial or light industrial distributions. Use it to protect motors, HVAC circuits, lighting feeders, and other 3-phase branch circuits where a reliable, trip-aware protection device is essential. Its bolt-on design minimizes loosening risk in environments with vibration or equipment movement, while the thermal-magnetic trip delivers consistent performance even as loads fluctuate throughout the workday.

Why choose this breaker over generic alternatives? It’s specifically engineered to pair with Siemens OEM load centers, offering a cohesive, manufacturer-supported protection solution that simplifies maintenance, spares you from compatibility headaches, and maintains system integrity across service life. If you need solid 3-pole protection in a 40A, 600V class with dependable trip behavior, the BQD6340 is built to deliver.