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RJF36300CU33AABSK - Molded Case Breaker 600V 300A 3-Pole

United Fuses
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The RJF36300CU33AABSK is a heavy-duty industrial circuit breaker designed for primary overcurrent protection in high-power electrical distribution systems. It is rated for 600V AC and 300A continuous current, with a robust interrupting capacity suitable for fault clearing in demanding environments. This unit features a compact, molded case construction with a weight of 55 lb, ensuring durability and ease of installation in standard panelboards. It complies with UL 489 and NEMA AB-1 standards, confirming its reliability for commercial and industrial applications. Typical uses include motor control centers, switchboards, and main service disconnects in manufacturing plants and data centers.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip, 3-pole
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Dimensions: Standard frame size for 600V class
  • Standards: UL 489, NEMA AB-1
  • Applications: Motor control centers, switchboards, main service disconnects
  • Switch Type: Toggle handle
  • Configuration: 3-pole, 3-phase
  • Coil Voltage Maximum: Not applicable (thermal-magnetic)
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: Standard industrial packaging
  • Phase: 3
  • Voltage: 600V AC
  • Amperage: 300A
  • AIC rating: 25kA at 600V AC
  • Connection: Line and load lugs
  • Poles: 3
  • Protection: Overcurrent and short circuit
  • Functions: On/Off switching, overload protection
  • Frame Size: Standard 600V frame
  • Trip Type: Thermal-magnetic
  • Panel Type: Standard panelboard
  • Breaker Type: Molded case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Up to 350 MCM
  • Metal Type: Copper alloy contacts
  • Panel Style: Enclosed
  • 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: Bolt-on
  • Hz: 50/60
  • Coil Material: Not applicable
  • Horse Power: 150 HP at 480V
  • Aux Contacts: 1 NO/NC
  • CPT: Not included
  • Full Load Amps: 300A
  • Dist Voltage: 600V
  • Bucket Size: Standard
  • Bucket Style: NEMA 1
  • Bucket Type: Enclosed
  • Full Load Amp Maximum: 300A
  • Full Load Amp Minimum: 0A
  • Enclosure: NEMA 1
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Copper or aluminum
  • Amperage Maximum: 300A
  • Amperage Minimum: 0A
  • Nema Rating: NEMA AB-1
  • Switch Style: Toggle
  • Wire Size: 4 AWG to 350 MCM
  • Certification: UL 489
  • Circuit Breaker Mounting Style: Bolt-on
  • Terminal Connection: Lug
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-phase
  • Standards: UL 489, NEMA AB-1
  • Compatible Frames: Standard 600V frames
  • Installation Type: Panelboard
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: Standard
  • Current Rating: 300A
  • 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
  • Weight: 55 lb


Product Identification
  • UPC: Not available
  • GTIN: Not available