Siemens FXD63B090 - 90 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens FXD63B090, a 90A, 600V, 3-pole bolt-on molded case circuit breaker designed to shield panelboards and load centers from overcurrent and short-circuit faults. Built for dependable protection in demanding environments, this unit combines sturdy construction with precise response to electrical faults.

• Secure bolt-on mounting — ensures a rigid, vibration-resistant bus connection in service panels.
• Thermal-magnetic trip unit — delivers stable, repeatable protection against both overloads and short circuits.
• Three-pole design — ideal for 3-phase systems, supporting higher power loads in commercial and light industrial settings.
• OEM-compatible — designed to pair with matching Siemens load centers and panelboards for seamless upgrades and replacements.
• Versatile applications — suitable for residential, commercial, and light industrial use, from home workshops to small manufacturing spaces.

Why this breaker makes sense for your panel

In real-world installations, the FXD63B090 minimizes downtime by reliably sensing overcurrent events and isolating the fault quickly. Its 600V rating expands its applicability to a broad range of panelboard configurations, while the 90A rating provides robust protection for mid-sized circuits and motor loads. The bolt-on mounting not only simplifies installation but also maintains a solid connection even where vibration, conduit movement, or panel layout would otherwise challenge stability.

Technical specifications at a glance

• Manufacturer: Siemens
• Part number: FXD63B090
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 90 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal scenarios and who benefits

electricians stocking service vans for panelboard maintenance, contractors updating commercial panels, and builders outfitting residential or light industrial spaces with reliable Siemens protection will find the FXD63B090 to be a dependable fit. It’s a practical choice for any installation that requires strong branch circuit protection with a sturdy, vibration-resistant mount and compatibility with Siemens OEM load centers and panelboards.

Protect your distribution system with a trusted, durable solution. The Siemens FXD63B090 delivers precise protection for 3-phase circuits, easy integration with existing Siemens panels, and the reliability you expect from a leading electrical equipment brand. Add this 90A, 600V, 3-pole bolt-on breaker to your order and ensure steady, safe operation of your electrical system.