Siemens FXD63B100 - 100 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens FXD63B100 is a rugged, bolt-on molded case circuit breaker designed to protect branch circuits inside panelboards and load centers with precision and reliability. With a 100A rating and a 600V capacity, this three-pole device is ready to tackle demanding residential, commercial, and light industrial applications, delivering consistent protection when it matters most. Key advantages that set the FXD63B100 apart

• Secure bolt-on mounting: A rigid, vibration-resistant bus connection reduces movement and ensures dependable electrical contact in environments where vibrations or cabinet movement are common.
• Thermal-magnetic trip unit: Combines steady thermal overload protection with an instantaneous magnetic trip for fast, repeatable responses to both overloads and short circuits.
• OEM-compatible design: Specifically engineered to pair with matching Siemens OEM load centers and panelboards, making replacements or upgrades straightforward and reliable.
• 3-pole configuration: Ideal for 3-phase systems or common-trip scenarios, enabling coordinated protection across multi-wire circuits.
• Versatile application range: A practical choice for residential, commercial, and light industrial installations where durable protection is essential.

Product at a glance

• Manufacturer: Siemens
• Part number: FXD63B100
• Type: Thermal-magnetic molded case circuit breaker
• Amp rating: 100 A
• Voltage rating: 600 V
• Poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical tips

When upgrading or replacing a breaker in Siemens-compatible panelboards or load centers, the FXD63B100 offers a seamless, reliable solution for protecting essential circuits. Its bolt-on mount is especially advantageous in installations where space is tight or vibration is a factor, helping to maintain solid electrical connections over time. The thermal-magnetic protection minimizes nuisance trips while effectively shutting down circuits during genuine faults, supporting safer operation of equipment and personnel.

For projects involving 3-phase power or multi-wire branch circuits, the FXD63B100 provides a dependable common-trip option that aligns with typical electrical standards and practices, making it a solid choice for both new builds and retrofit work. Choose this breaker when you need a proven Siemens solution that delivers consistent protection, straightforward installation, and long-term reliability in a compact, bolt-on form factor.