Siemens FXD63B090L - 90 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

When you need dependable branch-circuit protection in panelboards and load centers, the Siemens FXD63B090L delivers reliable performance with a purpose-built design. This 90A, 600V, 3-pole bolt-on molded case circuit breaker is engineered to keep electrical systems safe and running smoothly in residential, commercial, and light industrial settings.

Why the Siemens FXD63B090L stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus bars, reducing movement and ensuring consistent electrical contact in demanding environments.
• Thermal-magnetic trip unit combines overload protection with fast short-circuit response, delivering stable, repeatable protection across varying temperatures and loads.
• 3-pole design ideal for 3-phase systems, balancing protection across all hot conductors and guarding against phase-to-phase faults.
• OEM-compatible engineered to pair with matching Siemens OEM load centers and panelboards for straightforward replacement and seamless performance.
• Versatile application suitable for residential, commercial, and light industrial electrical infrastructure, from service panels to equipment feeders.

Key features and benefits

• A/-rated current 90A to handle moderate to heavy branch circuits without nuisance trips.
• Voltage rating up to 600V, expanding suitability to a wide range of electrical distribution applications.
• 3-pole construction provides comprehensive protection for 3-phase circuits and reduces the risk of unbalanced loads.
• Bolt-on mounting ensures a solid mechanical and electrical connection, minimizing vibration-related wear over time.
• Thermal-magnetic protection delivers precise trip characteristics that respond to both sustained overloads and short circuits.

Technical specifications at a glance

• Manufacturer: Siemens
• Part number: FXD63B090L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 90A
• Voltage rating: 600V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Use the FXD63B090L in panelboards and load centers serving commercial spaces, light industrial equipment rooms, or residential subpanels where 3-phase protection is required. It excels in motor-friendly environments where reliable short-circuit response minimizes downtime and protects critical equipment. Its bolt-on design makes it a practical choice for retrofit projects and new installations that demand a secure, vibration-resistant connection.

How this breaker helps your system

With a thermal-magnetic trip unit and a robust bolt-on mounting, the FXD63B090L delivers predictable protection for branch circuits. It helps prevent equipment damage from overloads and short circuits, reduces the likelihood of nuisance trips due to vibration or loose connections, and supports longer service life for your panel infrastructure. When you need a dependable, compatible solution for Siemens-compatible panels, this 3-pole breaker is a precise fit.

Practical installation tips

Ensure you’re pairing the FXD63B090L with matching Siemens OEM load centers or panelboards for optimal performance. Follow standard safety practices and manufacturer mounting guidelines when performing bolt-on installations to maximize contact integrity and protection reliability over time.