Siemens BQD320 20A 480V 3 Pole Circuit Breaker

Introducing the Siemens BQD320 — a 20A, 480V, 3‑pole bolt‑on molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Built for consistent performance, this unit combines rugged mounting with precise protection features to keep electrical systems safe and operational.

What makes the BQD320 stand out

• Secure bolt‑on mounting: The bolt‑on design creates a rigid, vibration‑resistant bus connection, reducing movement that can affect performance in busy electrical environments.
• Thermal‑magnetic trip unit: This combination trip mechanism provides stable, repeatable protection for both overloads and short circuits, ensuring predictable responses under varying temperatures and load conditions.
• OEM compatibility: Specifically engineered to be compatible with matching Siemens OEM load centers and panelboards, simplifying replacement and maintenance without sacrificing fit or performance.
• Versatile application: Ideal for residential, commercial, and light industrial settings where dependable overcurrent and short‑circuit protection is essential.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: BQD320
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 480V
• Number of Poles: 3
• Mounting Style: Bolt‑on
• Application: Branch circuit overcurrent and short‑circuit protection

Who should consider the Siemens BQD320

Businesses and homeowners deploying Siemens‑based electrical panels will benefit from this breaker’s seamless integration with OEM panelboards. It’s particularly well suited for panels in environments where vibration is common or where secure mounting and dependable trip performance are priorities. The 3‑pole configuration at 480V makes it a practical choice for distributing power safely across three phases in commercial or light industrial applications, while still serving residential installations that require robust 3‑pole protection.

Practical use cases and benefits

• Upgrade or replace a worn or mismatched breaker in Siemens panelboards and load centers to restore reliable protection and ensure code‑compliant operation.
• Install in panel distributions that experience routine vibration or movement, where a secure bolt‑on connection minimizes loosening and related trip issues.
• Code‑compliant branch circuit protection for 3‑phase systems in light commercial settings, reducing the risk of overheating and short‑circuit damage.
• Simplified maintenance with OEM‑matched components that fit precisely, streamlining inventory management and service workflows.

The Siemens BQD320 is more than just a breaker — it’s a purpose‑built solution for reliable electrical protection, crafted to work in harmony with Siemens panelboards and load centers. With its precise thermal‑magnetic protection, rigid bolt‑on mounting, and OEM compatibility, it helps you maintain safe, efficient, and compliant electrical infrastructure across a range of environments.