Siemens HFXD63B125 125A 3P Circuit Breaker, Bolt-On | AmpState

Meet the Siemens HFXD63B125 — a robust 125 A, 3‑pole bolt‑on circuit breaker designed to deliver dependable protection in panelboards, load centers, and electrical distribution systems. Built for retrofit work and maintenance planning, this part number stays consistent to simplify inventory and service workflows.

The bolt‑on design provides a secure, vibration‑resistant mount in compatible Siemens enclosures, enabling fast installation and reliable long‑term operation. With three‑phase protection at a 125 A rating, it’s well suited for demanding commercial and industrial electrical distributions where uptime and safety are paramount.

What makes this breaker distinct

• 3‑pole, 125 A protection for reliable interruption across three‑phase circuits.
• Bolt‑on mounting for quick, secure installation in Siemens panelboards and load centers.
• Part number stability ideal for retrofit projects and maintenance planning, reducing compatibility risk.
• Trusted Siemens engineering designed to perform consistently in demanding distribution environments.

Ideal use cases

• Retrofit installations where you need to maintain the same part number across updates or expansions.
• Maintenance stocking for facilities teams, minimizing downtime during fault isolation and servicing.
• New or replacement installs within Siemens panelboards and load centers that require reliable 3‑phase protection.
• Industrial or commercial electrical systems that demand durable, straightforward serviceability.

Product details at a glance: Siemens HFXD63B125, 125 A, 3 poles, bolt‑on circuit breaker, designed for panelboards, load centers, and electrical distribution. AmpState provides this part and can assist with compatibility confirmation to ensure a precise match for your panel configuration. If you need help matching a part number or confirming compatibility, message us and we’ll help you confirm fit.