Siemens FXD63B150L - 150 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens FXD63B150L is a robust 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. Rated at 150 A and 600 V, this unit is engineered to handle the demands of modern electrical systems with precision and durability.

Why the FXD63B150L stands out

• Secure bolt-on mounting: A rigid, vibration-resistant connection to the bus ensures consistent electrical contact and reduces the risk of loose fittings in environments with movement or vibration.
• Thermal-magnetic trip unit: Combines thermal overload protection with instantaneous magnetic trip, delivering stable and repeatable protection against sustained overcurrents and short circuits alike.
• Three-pole design: Ideal for balanced three-phase circuits common in commercial and light industrial applications, providing coordinated protection across all phases.
• OEM compatibility: Designed to pair seamlessly with matching Siemens load centers and panelboards, ensuring reliable fit, performance, and coordination within existing systems.
• Versatility across settings: Suitable for residential, commercial, and light industrial installations where reliable overcurrent and short-circuit protection is essential.

Specifications at a glance

• Amperage rating: 150 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Type: Thermal-magnetic molded case circuit breaker
• Part number: FXD63B150L
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

• Upgrading panelboards in small to midsize commercial spaces where reliable three-phase protection is required.
• Retrofitting existing Siemens systems or OEM load centers to enhance protection against overloads and short circuits.
• Protecting critical equipment in light industrial environments—think motors, compressors, and HVAC controls—where stable trip performance minimizes downtime.
• Integrating into new construction projects that demand durable, vibration-tolerant circuit protection with solid bus connections.

Installation and performance insights

The FXD63B150L is engineered for dependable, long-term operation in panelboards and load centers that support bolt-on molded case breakers. Its combination of thermal and magnetic trip actions helps reduce nuisance trips while delivering fast isolation during short circuits. For best results, pair this breaker with compatible Siemens equipment and follow standard electrical practices for bolt-on installations in accordance with local codes. Always verify panelboard compatibility and ensure proper wiring, torque management, and coordination with the rest of the protection scheme.

Engineered by Siemens for reliability, the FXD63B150L offers a clear, purpose-built solution for three-phase protection needs in residential-adjacent, commercial, and light industrial applications. It’s a precise fit for professionals seeking a durable, OEM-compatible breaker that delivers strong protection where it matters most.