Siemens BQD245 - 45 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQD245 is a 2-pole, 45 A, 480 V bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With secure bolt-on mounting, it creates a rigid, vibration-resistant bus connection, helping maintain reliable electrical performance in demanding environments. The thermal-magnetic trip unit delivers stable, repeatable protection, responding quickly to short circuits while avoiding nuisance trips on normal load fluctuations.

Key specifications

• Amperage rating: 45 A
• Voltage rating: 480 V
• Number of poles: 2
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Application: Branch circuit overcurrent and short-circuit protection
• Manufacturer: Siemens

Why this breaker stands out

• Secure bolt-on mounting ensures a rigid bus connection and reduces the risk of voltage disturbances from vibration in tough installation environments.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance, balancing fast response to faults with resistance to nuisance trips during normal load changes.
• OEM compatibility is designed to work with matching Siemens load centers and panelboards, making replacements and upgrades straightforward without compromising system integrity.
• Versatile application range supports residential, commercial, and light industrial settings that require dependable 480 V circuit protection.

Ideal use scenarios

• Upgrading or replacing existing 2-pole breakers in Siemens-compatible panelboards and load centers within 480 V distribution systems.
• Protecting branch circuits in commercial lighting, HVAC, and other 480 V infrastructure where reliable short-circuit protection is essential.
• Integrating into new installations in light industrial environments where durable, vibration-resistant connections improve long-term reliability.

Compatibility and installation

The BQD245 is specifically designed to be compatible with matching OEM Siemens load centers and panelboards, ensuring a cohesive protection solution across your electrical distribution equipment. When installing, verify proper bolt-on mounting alignment to maintain a solid bus connection and confirm that the connected panels are rated for 480 V and 2-pole operation. Follow standard safe installation practices and any panelboard manufacturer guidelines to ensure optimal performance and compliance.

Tips for reliable protection

• Use in circuits and panels that match the 480 V, 2-pole specification to ensure the breaker operates within its designed thermal-magnetic range.
• Periodically inspect the bolt-on connection for tightness and signs of wear or corrosion, which can affect protection performance over time.
• When upgrading to or from similar Siemens devices, confirm the BQD245’s compatibility with the exact panelboard model to maintain warranty and UL-listed integrity.
• Document ampacity and voltage ratings in your electrical documentation to prevent mismatched replacements in future maintenance tasks.