CND63B120 - 1200Amp Circuit Breaker

CND63B120 - 1200Amp Circuit Breaker

The CND63B120 Siemens SENTRON molded case circuit breaker is a 1200 Amp, 3-pole ND frame breaker used in large commercial and industrial power distribution systems where electrical loads are heavy and consistent protection is essential. You’ll typically find this type of breaker in main switchboards, service entrances, and large feeder circuits operating on 480V and 600V three-phase systems.

This unit uses a thermal-magnetic trip system, which provides standard protection against overloads and short circuits. It also features a current-limiting design, helping the system respond to fault conditions within its rated interrupting capacity. With ratings of 100kA at 480V and 65kA at 600V, it is intended for systems where available fault current levels need to be properly accounted for during design and operation.

At its core, this breaker is used to keep existing Siemens ND frame systems operating as intended — matching form, fit, and function in established electrical infrastructure where consistency matters.

Key Features and Benefits

• 1200 Amp, 3-pole Siemens ND frame molded case circuit breaker
• Designed for Siemens SENTRON power distribution systems
• Thermal-magnetic trip unit for standard protection functions
• Current-limiting design for controlled fault response
• High interrupting ratings: 100kA @ 480V, 65kA @ 600V
• Includes line and load side lugs (TA4N8500)
• Accepts 250–500 kcmil Cu/Al conductors
• 40°C rated for defined operating environments
• 3-pole simultaneous disconnect for three-phase systems
• Used in feeder and main service applications
• Designed for maintenance and replacement in existing systems

Technical Specifications

• Catalog Number: CND63B120
• Product Type: Molded Case Circuit Breaker
• Frame Type: ND Frame
• Amperage Rating: 1200 Amps
• Poles: 3
• Voltage Rating: 600V AC
• Interrupting Rating: 100kA @ 480V; 65kA @ 600V
• Trip Unit: Thermal-Magnetic
• Temperature Rating: 40°C
• Conductor Range: 250–500 kcmil Cu/Al
• Included: Line and load side lugs (TA4N8500)
• Dimensions: 9 in W x 16 in H x 6 in D
• Net Weight: 54.739 lb

Material Compliance and Certifications

The CND63B120 Siemens SENTRON breaker is designed in accordance with UL 489 and IEC 60947-2 standards for molded case circuit breakers used in industrial and commercial electrical distribution systems. It is intended for installation in compatible Siemens ND frame assemblies and should be installed by qualified electrical personnel following applicable electrical codes and manufacturer guidelines.

Where It Works Best

• Industrial power distribution systems
• Siemens SENTRON switchboards and panelboards
• Main service and feeder circuit protection
• Large commercial facilities and infrastructure
• 480V and 600V three-phase systems
• High-load electrical distribution setups
• Maintenance and replacement in existing ND frame systems
• Engineered electrical distribution networks