Siemens CFD63B250 - 250 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Dependable, high-performance protection for demanding electrical systems starts with the Siemens CFD63B250. This 3-pole, 250A, 600V bolt-on molded case circuit breaker is engineered for rugged panelboards and loadcenters, delivering consistent overcurrent and short-circuit protection where it matters most—without compromising uptime.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, keeping your circuits protected in environments with constant movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining precise thermal overload sensing with fast magnetic action for short circuits—minimizing nuisance trips while responding quickly to dangerous faults.
• OEM-compatible design is built to pair with matching Siemens loadcenters and panelboards, ensuring coordinated protection and clean electrical coordination across your system.
• Versatile application suited for residential, commercial, and light industrial deployments, from service feeders to main branch protection in modern panel assemblies.

What makes the CFD63B250 stand out

Unlike generic breakers, the CFD63B250 is purpose-built for Siemens panel ecosystems, delivering precise trip characteristics matched to the panel’s bus design. The bolt-on format not only secures a solid mechanical connection but also enhances electrical continuity in installations where vibration or periodic maintenance could loosen connections. With a 250A rating and 600V capacity, it handles substantial fault currents while maintaining predictable, safe operation under normal load conditions.

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: CFD63B250
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 250 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Upgrading or expanding panelboards in commercial spaces where reliable disconnect and fault isolation are critical
• Protecting large feeders in light industrial settings with higher fault current potential
• Residential or mixed-use installations requiring robust, OEM-compatible protection within Siemens systems

Practical installation and deployment tips

• Ensure compatibility with your specific Siemens loadcenter or panelboard model to maintain coordinated protection and labeling accuracy.
• Torque the mounting bolts to the manufacturer’s specification to preserve the integrity of the bus connection and trip calibration.
• Verify that conductor sizing and ampacity align with the 250A rating, and ensure suitable short-circuit current rating is appropriate for the installation environment.
• Plan for easy serviceability by documenting the breaker location and keeping a spare CFD63B250 on hand for quick swaps during maintenance windows.