Siemens CPD63B120 - 1200 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens CPD63B120 is a robust 3-pole bolt-on molded case circuit breaker designed to protect panelboards and load centers from dangerous overcurrents and short circuits. With a demanding 1200A rating at 600V, this breaker is built to handle substantial loads in commercial and light industrial settings, while still being suitable for select residential applications that require three-phase protection.

Key advantages that matter in real-world panels

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, enhancing long-term reliability in environments subject to movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance, reducing nuisance trips and preserving critical circuits during overloads or faults.
• OEM compatibility designed to work seamlessly with matching Siemens load centers and panelboards for straightforward installation and reliable coordination within existing electrical systems.
• Durable molded-case construction combines solid protection with a compact form factor suitable for panelboard architectures where space and reliability matter.
• Three-pole design enables effective protection across all three phases, essential for balanced three-phase distribution networks.

Ideal use cases and practical applications

Use the CPD63B120 where you need dependable branch-circuit protection for substantial loads and multi-phase setups. It’s a strong fit for commercial spaces, light industrial equipment feed, and any installation that benefits from a high-current, three-pole protector integrated into Siemens OEM panels. In residential settings where three-phase protection is required or desired for future expansion, this breaker provides a scalable solution without compromising safety or performance.

Technical snapshot

• Manufacturer: Siemens
• Part Number: CPD63B120
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 1200A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Installation and best practices

For optimal performance, install the CPD63B120 in a compatible Siemens panelboard or load center using proper bolt-on hardware. Ensure secure torque on mounting fasteners to maintain the vibration-resistant connection, and coordinate protection with the rest of the distribution system to avoid nuisance trips and ensure selective tripping during faults.