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ECB1200NSK - Molded Case Circuit Breaker 1200A 600V AC

United Fuses
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The ECB1200NSK is a molded case circuit breaker designed for overcurrent and short-circuit protection in industrial power distribution systems. It is rated for 1200 amps at up to 600 volts AC, providing reliable interruption of fault currents. This unit measures 11 inches in depth, 7 inches in height, and 7.5 inches in width, with a weight of 4.37 pounds, and features a compact, robust construction suitable for panelboard or switchboard installation. It complies with UL 489 standards for circuit breakers, ensuring safe operation in commercial and industrial environments. Typical applications include main feeder protection, branch circuit protection, and motor control centers in manufacturing plants, data centers, and large commercial facilities.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip, fixed mount
  • Voltage Rating: 600 V AC
  • Current Rating: 1200 A
  • Dimensions: 11 in x 7 in x 7.5 in (Length/Depth x Height x Width)
  • Standards: UL 489, CSA C22.2 No. 5
  • Applications: Main feeder protection, branch circuit protection, motor control centers
  • Switch Type: Toggle handle
  • Configuration: 3-pole
  • Coil Voltage Maximum: Not applicable (thermal-magnetic)
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: 11 in x 7 in x 7.5 in
  • Phase: 3-phase
  • Voltage: 600 V AC
  • Amperage: 1200 A
  • AIC rating: 25 kA at 480 V AC
  • Connection: Line and load lugs
  • Poles: 3
  • Protection: Overcurrent and short-circuit
  • Functions: Thermal-magnetic trip
  • Frame Size: 1200 A frame
  • Trip Type: Thermal-magnetic
  • Panel Type: Panelboard or switchboard
  • Breaker Type: Molded case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: 500 MCM max
  • Metal Type: Steel enclosure
  • Panel Style: Fixed
  • Bus Type: Copper
  • Fuse Class: Not applicable
  • Insulation Temperature: 105°C
  • Inductance: Not specified
  • Impedance: Not specified
  • Barrels: Not applicable
  • Class Rating: Not applicable
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not applicable
  • Clas: Not applicable
  • Mounting: Fixed
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Optional
  • CPT: Not included
  • Full Load Amps: 1200 A
  • Dist Voltage: Not applicable
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 1200 A
  • Full Load Amp Minimum: Not applicable
  • Enclosure: Type 1
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Copper or aluminum
  • Amperage Maximum: 1200 A
  • Amperage Minimum: Not applicable
  • Nema Rating: 1
  • Switch Style: Toggle
  • Wire Size: 500 MCM max
  • Certification: UL listed
  • Circuit Breaker Mounting Style: Fixed
  • Terminal Connection: Lugs
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-phase
  • Standards: UL 489
  • Compatible Frames: Not applicable
  • Installation Type: Panelboard or switchboard
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: 1200 A
  • Current Rating: 1200 A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not specified
  • Peak Pulse Current: Not applicable
  • Breakdown Voltage (MIN VBR@IT ) (V): Not applicable
  • Breakdown Voltage (VBR@IT) (V): Not applicable
  • Polarity: Not applicable
  • Operating Temperature Maximum Celsius: 40°C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 78668966279
  • GTIN: 00786689662790