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Q4L3300MB - Molded Case Circuit Breaker 300A 600V

United Fuses
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The Q4L3300MB is a molded case circuit breaker designed for primary overcurrent and short-circuit protection in industrial power distribution systems. It is rated for 600V AC and carries a continuous current rating of 300A, with a robust interrupting capacity suitable for high-fault applications. This three-pole breaker features a compact frame construction weighing 5.19 lb, utilizing a thermal-magnetic trip mechanism for reliable overload and short-circuit response. It complies with UL 489 and CSA standards, ensuring safe operation in commercial and industrial environments. Typical applications include motor control centers, panelboards, and switchboards requiring dependable branch circuit protection.

Key Features & Specifications
  • Type: Molded case circuit breaker, thermal-magnetic trip
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Dimensions: Compact frame size
  • Standards: UL 489, CSA
  • Applications: Industrial power distribution, motor control centers, panelboards
  • Switch Type: Toggle
  • Configuration: Three-pole
  • Coil Voltage Maximum: N/A
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: Standard
  • Phase: Three-phase
  • Voltage: 600V AC
  • Amperage: 300A
  • AIC rating: High interrupting capacity
  • Connection: Line and load lugs
  • Poles: 3
  • Protection: Overcurrent and short-circuit
  • Functions: Overload and short-circuit protection
  • Frame Size: Compact
  • Trip Type: Thermal-magnetic
  • Panel Type: N/A
  • Breaker Type: Molded case
  • Control Voltage Minimum: N/A
  • Control Voltage Maximum: N/A
  • MCM Size: N/A
  • Metal Type: Steel
  • Panel Style: N/A
  • Bus Type: N/A
  • Fuse Class: N/A
  • Insulation Temperature: 105°C
  • Inductance: N/A
  • Impedance: N/A
  • Barrels: N/A
  • Class Rating: N/A
  • Diameter: N/A
  • Velocity: N/A
  • Clip Center: N/A
  • Clas: N/A
  • Mounting: Panel mount
  • Hz: 50/60 Hz
  • Coil Material: N/A
  • Horse Power: N/A
  • Aux Contacts: N/A
  • CPT: N/A
  • Full Load Amps: 300A
  • Dist Voltage: 600V AC
  • Bucket Size: N/A
  • Bucket Style: N/A
  • Bucket Type: N/A
  • Full Load Amp Maximum: 300A
  • Full Load Amp Minimum: 0A
  • Enclosure: Open
  • Relay Style: N/A
  • Coil Voltage Minimum: N/A
  • Wire: N/A
  • Amperage Maximum: 300A
  • Amperage Minimum: 0A
  • Nema Rating: N/A
  • Switch Style: Toggle
  • Wire Size: N/A
  • Certification: UL 489, CSA
  • Circuit Breaker Mounting Style: Panel mount
  • Terminal Connection: Lugs
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Three-phase
  • Standards: UL 489, CSA
  • Compatible Frames: N/A
  • Installation Type: Fixed
  • Item QTY: 1
  • Nema Starter Size: N/A
  • Breaker Frame: Compact
  • Current Rating: 300A
  • Reverse Standoff Voltage: N/A
  • Watts: N/A
  • Peak Pulse Current: N/A
  • Breakdown Voltage (MIN VBR@IT ) (V): N/A
  • Breakdown Voltage (VBR@IT) (V): N/A
  • Polarity: N/A
  • Operating Temperature Maximum Celsius: 40°C
  • Max Clamp Voltage: N/A
  • On-State Current: N/A


Product Identification
  • UPC: Not provided
  • GTIN: Not provided