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Square D LH36300CBA - 3-Pole 300A Molded Case Breaker (600V AC)

Square D
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Square D LH36300CBA is a 3-pole molded case circuit breaker from the I-Line family, designed for thermal magnetic protection with LI (Long-Time and Instantaneous) functions. It is rated for 600V AC, 300A continuous current, and 35kA interrupting capacity at 480V, with a 3-phase configuration and I-Line style plug-in connection. The L Frame breaker weighs 28 lb and features a compact molded case construction for panelboard integration. It complies with industry standards for overcurrent protection in commercial and industrial power distribution systems. Typical applications include branch circuit protection, feeder protection, and main disconnect service in switchboards and panelboards.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal Magnetic, LI (Long-Time and Instantaneous) Protection
  • Voltage Rating: 600V AC
  • Current Rating: 300A
  • Dimensions: L Frame
  • Standards: UL 489, CSA C22.2 No. 5
  • Applications: Commercial and industrial power distribution, branch circuit protection, feeder protection
  • Switch Type: I-Line Style Plug-In
  • Configuration: 3-Pole, 3-Phase
  • Coil Voltage Maximum: Not applicable (thermal magnetic)
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: 6.5 x 4.5 x 10.5 in
  • Phase: 3
  • Voltage: 600V
  • Amperage: 300A
  • AIC rating: 35kA@480V
  • Connection: I-Line Style Plug-In
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: L Frame
  • Trip Type: Thermal Magnetic
  • Panel Type: I-Line Panelboard
  • Breaker Type: LH
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not specified
  • Metal Type: Molded case (plastic/steel)
  • Panel Style: I-Line
  • Bus Type: I-Line
  • 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: Plug-In
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not included
  • CPT: Not included
  • Full Load Amps: 300A
  • Dist Voltage: 600V
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 300A
  • Full Load Amp Minimum: Not applicable
  • Enclosure: Open (no enclosure)
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not specified
  • Amperage Maximum: 300A
  • Amperage Minimum: Not applicable
  • Nema Rating: Not specified
  • Switch Style: I-Line Plug-In
  • Wire Size: Not specified
  • Certification: UL 489, CSA
  • Circuit Breaker Mounting Style: Plug-In
  • Terminal Connection: I-Line
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 3-Phase
  • Standards: UL 489, CSA C22.2 No. 5
  • Compatible Frames: L Frame
  • Installation Type: Panelboard
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: L Frame
  • 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


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