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Square D HJA36125UN - Molded Case Circuit Breaker 125A 600V 3-Pole

Square D
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Square D HJA36125UN is a three-pole molded case circuit breaker from the Powerpact family, designed for overcurrent protection in industrial power distribution systems. It is rated for 600V AC, 125A continuous current, and provides a 65kA interrupting capacity at 480V through thermal-magnetic protection with LI (Long-Time and Instantaneous) trip functions. The unit weighs 5 lb and features an I-Line style plug-in connection for secure panel mounting. This breaker complies with UL and NEMA standards for industrial environments. It is commonly used in motor control centers, switchboards, and panelboards requiring reliable branch circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Powerpact HJA frame, thermal-magnetic operation
  • Voltage Rating: 600V AC
  • Current Rating: 125A
  • Dimensions: Standard Powerpact HJA frame size
  • Standards: UL 489, NEMA AB-1
  • Applications: Industrial power distribution, motor control centers, switchboards
  • Switch Type: Non-fused
  • Configuration: Three-pole
  • Coil Voltage Maximum: Not applicable (thermal-magnetic)
  • Temp Rating: 40°C ambient
  • Shipping Dimensions: 6 x 4 x 4 in (approx.)
  • Phase: 3
  • Voltage: 600V
  • Amperage: 125A
  • AIC rating: 65kA@480V
  • Connection: I-Line Style Plug-In
  • Poles: 3
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: HJA
  • Trip Type: Thermal-magnetic
  • Panel Type: I-Line compatible
  • Breaker Type: Molded Case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Copper alloy contacts
  • Panel Style: I-Line
  • Bus Type: I-Line
  • Fuse Class: Not applicable
  • Insulation Temperature: 105°C
  • 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: Plug-in
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: 125 HP at 480V (approx.)
  • Aux Contacts: Not included
  • CPT: Not included
  • Full Load Amps: 125A
  • Dist Voltage: 600V
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: 125A
  • Full Load Amp Minimum: 0A
  • Enclosure: Open type
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: Not applicable
  • Amperage Maximum: 125A
  • Amperage Minimum: 0A
  • Nema Rating: NEMA AB-1
  • Switch Style: Toggle
  • Wire Size: 14 AWG to 2/0 AWG (copper)
  • Certification: UL 489
  • Circuit Breaker Mounting Style: Plug-in
  • Terminal Connection: I-Line
  • Frequency Rating: 50/60 Hz
  • Phase Connection: Three-phase
  • Standards: UL 489, CSA C22.2 No. 5
  • Compatible Frames: Powerpact HJA
  • Installation Type: Panelboard
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: HJA
  • Current Rating: 125A
  • Reverse Standoff Voltage: Not applicable
  • Watts: Not applicable
  • 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: 785901893547
  • GTIN: 00785901893547