Siemens BQD145 45A 1P 277V Circuit Breaker, Bolt-On | AmpState

The Siemens BQD145 is a trusted, single-pole circuit breaker built for reliable overcurrent protection in commercial and industrial electrical systems. With a 45 A rating and a 277 V operating capability, this bolt-on device is designed for panelboards, load centers, and electrical distribution setups where dependable, code-compliant protection matters most.

Key specifications at a glance

• Amperage: 45 A
• Poles: 1-Pole
• Voltage: 277 V
• Mounting: Bolt-On
• Manufacturer: Siemens
• Part Number: BQD145
• Product Type: Circuit Breaker

Why this breaker stands out

Designed for everyday electrical work, the BQD145 excels in replacement projects and spare stocking. Its bolt-on mounting provides a secure, vibration-resistant connection in panelboards and load centers, helping maintain service continuity in critical facilities. Keeping a compatible spare on hand — especially one that aligns with the original BOM — minimizes downtime and simplifies maintenance when components reach end of life or require rapid replacement.

Ideal use cases

• Replacing failed breakers in Siemens panelboards and distribution panels while preserving original BOM alignment.
• Stocking a ready-to-go spare for service trucks or in-house maintenance inventories, reducing downtime during outages.
• Upgrading or rotating components in commercial electrical installations that run on 277 V single-phase circuits.

Compatibility and support

This listing covers the Siemens BQD145 45 A, 1P, 277 V bolt-on circuit breaker. If you’re unsure about fit or need a quick compatibility check, AmpState offers assistance to confirm the correct part match. Message us and we’ll help verify compatibility with your panel, ensuring a seamless replacement.