Siemens BQD6345 - 45 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens BQD6345—a 3-pole, bolt-on molded case circuit breaker engineered to deliver dependable branch circuit protection in panelboards and load centers. Rated at 45A and 600V, it’s built to handle the demanding needs of residential environments that scale into commercial and light industrial applications.

• Secure bolt-on mounting: Provides a rigid, vibration-resistant bus connection that stays right where it belongs, reducing nuisance trips and connection looseness in demanding settings.
• Thermal-magnetic trip unit: Combines a precise thermal element with magnetic instantaneous protection for stable, repeatable responses to overloads and short circuits—helping you avoid cascading faults and minimize downtime.
• 3-pole configuration: Ensures synchronized protection across all phases, safeguarding equipment and downstream breakers in multi-wire circuits.
• 600V rating: Suitable for higher-voltage distribution common in commercial and light industrial panels, while still performing reliably in mixed residential/commercial environments.
• OEM-compatible design: Crafted to pair with matching Siemens OEM load centers and panelboards, ensuring straightforward integration and consistent performance with your existing infrastructure.
• Built for durability: Molded-case construction resists environmental stress and provides long-lasting protection in busy electrical rooms and service panels.

What problems does the BQD6345 solve?

In any panel where multiple circuits share a bus, overcurrent and short-circuit events can propagate quickly. The BQD6345’s robust bolt-on mount minimizes mechanical movement that can lead to intermittent trips, while its thermal-magnetic trip unit delivers fast, predictable responses to faults. This means fewer unexplained outages, reduced arc-flash risk during maintenance, and smoother coordination with other protective devices in your system.

Ideal use cases

• New installations in light commercial spaces where reliable, high-quality protection is essential.
• Panel upgrades or retrofits that require a 3-pole, 45A device with strong mounting and OEM compatibility.
• Residential-to-commercial conversions where panelboards and load centers demand durable protection against drawing fault currents and short circuits.
• Maintenance scenarios in which a stable, repeatable protection profile minimizes nuisance trips and simplifies troubleshooting.

Who benefits most

• Electrical contractors installing or upgrading panelboards in small to mid-size commercial buildings.
• Facilities managers overseeing mixed-use spaces with modular electrical infrastructure.
• Field technicians responsible for ensuring code-compliant, reliable protection across multi-wire circuits.

Specs at a glance

• Manufacturer: Siemens
• Part Number: BQD6345
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choosing the Siemens BQD6345 means investing in a proven, purpose-built solution for protecting critical electrical infrastructure. Its combination of secure mounting, precise trip technology, and OEM compatibility translates to reliable performance, easier serviceability, and confidence that your panelboard or load center will respond as intended when demand spikes or a fault occurs. If you’re planning a compliant, resilient protection strategy for residential-to-light-industrial projects, this 3-pole, 45A, 600V bolt-on breaker from AmpState is a strong, future-ready choice.