Siemens BQD125 - 25 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQD125 is a purpose-built 1-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in modern electrical setups. With a 25A rating at 277V, it’s designed to safeguard single‑phase distribution in panelboards and load centers where space and reliability matter.

• Secure bolt-on mounting: engineered for a rigid, vibration‑resistant bus connection that stays tight through equipment start‑ups and routine operation, reducing the risk of loose contacts over time.
• Thermal‑magnetic trip unit: combines a precise thermal element for overload protection with a fast magnetic trip for short‑circuit events, delivering stable, repeatable protection that trips exactly when needed.
• OEM-compatible design: engineered to be compatible with matching Siemens load centers and panelboards, ensuring a clean fit and reliable integration in your existing electrical infrastructure.
• Versatile for multiple settings: ideal for residential, commercial, and light industrial applications where safety and reliability are paramount in 277V branch circuits.
• 1‑pole, 277V protection: designed for single‑pole operation on 277V systems, common in commercial lighting and certain auxiliary circuits, providing focused protection where you need it most.

What this means for your electrical system: a compact, rugged breaker that installs quickly, maintains a solid bus connection, and delivers predictable protection against both overcurrent and short circuits. By choosing a bolt-on design that’s purpose-built for Siemens panelboards, you’re investing in a component that reduces downtime, simplifies maintenance, and supports long‑term circuit reliability.

Ideal use cases

• Upgrading or replacing a worn 1‑pole breaker in Siemens panelboards or load centers designed for bolt‑on devices
• Protecting 277V branch circuits in commercial lighting, small motors, or auxiliary equipment in office buildings and light industrial spaces
• Retrofit projects where a secure, vibration‑resistant connection is critical to sustained performance

Technical snapshot

• Manufacturer: Siemens
• Part number: BQD125
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage rating: 25A
• Voltage rating: 277V
• Poles: 1
• Mounting style: Bolt-on
• Applications: Branch circuit overcurrent and short‑circuit protection

Choose the Siemens BQD125 when you need a reliable, purpose‑built solution for 277V single‑pole protection that integrates seamlessly with Siemens equipment. It’s a practical, long‑term choice for electricians and facilities teams aiming to maintain safe, compliant electrical distribution across commercial and light industrial environments.