Siemens CND63B120 - 1200 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens CND63B120—a rugged, high-capacity 3-pole bolt-on molded case circuit breaker built for reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With a 1200A rating and 600V capacity, it’s engineered to handle demanding electrical feeders while maintaining precise protection characteristics.

Why this breaker stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant connection to the bus, reducing movement and wear in environments with door traffic, equipment vibration, or panel handling.
• Thermal-magnetic trip unit provides stable, repeatable protection across a wide range of temperatures and load conditions, balancing fast response to faults with reduced nuisance trips.
• OEM-compatible design is engineered to fit seamlessly with matching Siemens load centers and panelboards, ensuring consistent protection without retrofit compromises.
• Three-pole configuration supports three-phase electrical systems, ideal for balanced distribution in commercial and light industrial applications.
• Versatile application suitable for residential, commercial, and light industrial service panels where high-current protection and dependable performance are critical.

Technical snapshot

• Manufacturer: Siemens
• Part Number: CND63B120
• 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

Who should consider the Siemens CND63B120? electrical professionals who design, install, or upgrade panelboards and load centers that demand high-current protection. It’s particularly well-suited for large feeders in commercial spaces, service panels in multi-tenant buildings, and light-industrial power distribution where reliability and dimensional compatibility matter.

Practical guidance for use: pair this 1200A, 600V, 3-pole breaker with compatible Siemens load centers to maintain consistent protection coordination across the entire distribution system. Its bolt-on mounting simplifies replacement and reduces the risk of loose connections in dynamic environments, helping keep outages to a minimum and service continuity intact.