Siemens BQD345 - 45 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQD345 is a purpose-built 3-pole, 45 A, 480 V bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection for panelboards and load centers. Built for environments ranging from homes to light commercial and industrial spaces, this unit provides steady, reliable protection when safety and uptime matter most.

• Secure bolt-on mounting creates a rigid, vibration-resistant bus connection, reducing connection wear and ensuring consistent electrical contact even in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both sustained overloads and short-circuit events, helping prevent nuisance trips while safeguarding equipment.
• 3-pole design pairs with 3-phase systems for balanced protection across all phases, making it ideal for commercial and light industrial feeders.
• 480V rating aligns with higher-voltage distribution requirements, supporting a wide range of load centers and panelboards used in professional settings.
• 45A current rating provides appropriate overcurrent protection for mid-range circuits without unnecessarily constraining usable load.
• OEM-compatible is designed to work with matching Siemens OEM load centers and panelboards, ensuring a coordinated protection solution within your electrical distribution.
• Versatile applicability suited for residential, commercial, and light industrial applications, offering a common, scalable solution across projects.

What problems does the Siemens BQD345 solve?

When circuits face overloads or short circuits, a robust breaker is essential to prevent wiring damage, fire risk, and equipment downtime. The BQD345 combines secure installation with precise thermal-magnetic trip behavior to minimize unplanned outages and protect downstream gear, motors, lighting, and outlets in a clean, integrated package.

Use cases you can count on

• Upgrading or expanding a panelboard in small office suites or retail spaces that use 3-phase distribution.
• Providing final branch protection for shared commercial loads, such as lighting and receptacle banks in modular spaces.
• Integrating into residential-to-light industrial setups where consistent trip performance and reliable mounting are priorities.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: BQD345
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45 A
• Voltage Rating: 480 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choose the Siemens BQD345 when you need a reliable, OEM-compatible, 3-pole breaker that performs consistently under real-world loads. Its bolt-on design, robust trip mechanism, and compatibility with Siemens panelboards make it a smart, long-term solution for safeguarding electrical distribution in a variety of settings.