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Square D HJA260503 - Molded Case 50A 600V Breaker

Square D
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The Square D HJA260503 is a Powerpact molded case circuit breaker designed for thermal magnetic overcurrent protection in industrial power distribution systems. This 2-pole, 50A unit operates at 600VAC with a 65kA interrupting capacity at 480V, utilizing I-Line style plug-in connection and supporting AWG 14 to AWG 3/0 aluminum or copper conductors. The breaker measures 6.4 in (163 mm) x 4.09 in (104 mm) x 3.4 in (86 mm) and weighs 3.999 lb, featuring LI (Long-Time and Instantaneous) trip functions for coordinated protection. It complies with UL, CSA, NEMA, NOM-003-SCFI-2000, and IEC 60947-2 standards, with an operating temperature range of 28-158 °F (-2-70 °C). Typical applications include motor control centers, panelboards, and switchboards in commercial and industrial facilities requiring reliable branch circuit protection.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Powerpact HJA series, thermal magnetic operation
  • Voltage Rating: 600V AC
  • Current Rating: 50A
  • Dimensions: 6.4 in (163 mm) x 4.09 in (104 mm) x 3.4 in (86 mm) (Height x Width x Depth)
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Applications: Industrial power distribution, motor control centers, panelboards
  • Switch Type: I-Line Style Plug-In
  • Configuration: 2 Poles
  • Coil Voltage Maximum: Not applicable (thermal magnetic)
  • Temp Rating: 28-158 °F (-2-70 °C)
  • Shipping Dimensions: 6.4 in x 4.09 in x 3.4 in
  • Phase: 1
  • Voltage: 600V
  • Amperage: 50A
  • AIC rating: 65kA@480V
  • Connection: I-Line Style Plug-In
  • Poles: 2
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Frame Size: Powerpact HJA
  • Trip Type: Thermal Magnetic
  • Panel Type: Not specified
  • Breaker Type: Molded Case
  • Control Voltage Minimum: Not applicable
  • Control Voltage Maximum: Not applicable
  • MCM Size: Not applicable
  • Metal Type: Not specified
  • Panel Style: Not specified
  • Bus Type: Not specified
  • 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: I-Line Style Plug-In
  • Hz: 50/60 Hz
  • Coil Material: Not applicable
  • Horse Power: Not specified
  • Aux Contacts: Not specified
  • CPT: Not specified
  • Full Load Amps: Not specified
  • Dist Voltage: Not specified
  • Bucket Size: Not applicable
  • Bucket Style: Not applicable
  • Bucket Type: Not applicable
  • Full Load Amp Maximum: Not specified
  • Full Load Amp Minimum: Not specified
  • Enclosure: Not specified
  • Relay Style: Not applicable
  • Coil Voltage Minimum: Not applicable
  • Wire: AWG 14...AWG 3/0 aluminium/copper terminal
  • Amperage Maximum: 50A
  • Amperage Minimum: Not specified
  • Nema Rating: Not specified
  • Switch Style: I-Line Style Plug-In
  • Wire Size: AWG 14...AWG 3/0 aluminium/copper terminal
  • Certification: UL, CSA, NOM
  • Circuit Breaker Mounting Style: I-Line Style Plug-In
  • Terminal Connection: I-Line Style Plug-In
  • Frequency Rating: 50/60 Hz
  • Phase Connection: 1
  • Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
  • Compatible Frames: Powerpact HJA
  • Installation Type: Plug-In
  • Item QTY: 1
  • Nema Starter Size: Not applicable
  • Breaker Frame: HJA
  • Current Rating: 50A
  • 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: 70 °C
  • Max Clamp Voltage: Not applicable
  • On-State Current: Not applicable