Thomas & Betts STEX300 - 300A Enclosed Circuit Breaker 600V AC
Thomas & Betts STEX300 - 300A Enclosed Circuit Breaker 600V AC

Thomas & Betts STEX300 - 300A Enclosed Circuit Breaker 600V AC

Thomas & Betts
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Thomas & Betts STEX300 is a 300A enclosed circuit breaker designed for primary overcurrent protection in industrial power distribution systems. It operates at 600V AC with a current rating of 300A, providing reliable fault interruption. The unit features a NEMA 3R-rated enclosure constructed from galvanized steel, weighing 4.5 lb, and is designed for surface mounting. It complies with UL 489 and CSA C22.2 standards for safety and performance. Typical applications include branch circuit protection in manufacturing plants, commercial buildings, and heavy machinery.

Key Features & Specifications
  • Type: Enclosed circuit breaker, molded case, thermal-magnetic trip
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Dimensions: Not specified
  • Standards: UL 489, CSA C22.2
  • Applications: Industrial power distribution, branch circuit protection
  • Switch Type: Toggle
  • Configuration: 3-pole
  • Coil Voltage Maximum: Not applicable
  • Temp Rating: Not specified
  • Shipping Dimensions: Not specified
  • Phase: 3
  • Voltage: 600V AC
  • Amperage: 300A
  • AIC rating: Not specified
  • Connection: Line and load lugs
  • Poles: 3
  • Protection: Overcurrent, short circuit
  • Functions: On/Off, trip indication
  • Frame Size: 300A
  • Trip Type: Thermal-magnetic
  • Panel Type: Not applicable
  • Breaker Type: Molded case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not specified
  • Metal Type: Galvanized steel
  • Panel Style: Not applicable
  • Bus Type: Not applicable
  • Fuse Class: Not applicable
  • Insulation Temperature: Not specified
  • Inductance: Not applicable
  • Impedance: Not applicable
  • Barrels: Not applicable
  • Class Rating: Not applicable
  • Diameter: Not applicable
  • Velocity: Not applicable
  • Clip Center: Not applicable
  • Clas: Not applicable
  • Mounting: Surface
  • Hz: 50/60
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not specified
  • Full Load Amps: 300A
  • Dist Voltage: Not specified
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 300A
  • Full Load Amp Minimum: Not specified
  • Enclosure: NEMA 3R
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not specified
  • Amperage Maximum: 300A
  • Amperage Minimum: Not specified
  • Nema Rating: 3R
  • Switch Style: Toggle
  • Wire Size: Not specified
  • Certification: UL, CSA
  • Circuit Breaker Mounting Style: Surface
  • Terminal Connection: Lugs
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-phase
  • Standards: UL 489, CSA C22.2
  • Compatible Frames: Not specified
  • Installation Type: Fixed
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: 300A
  • 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: Not specified
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable


Product Identification
  • UPC: 78621099680
  • GTIN: 00786210996806