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Square D 999390 - Molded Case 90A 600V 3-Pole

Square D
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Square D 999390 is a 90A, 3-pole molded case circuit breaker from the 99 Series, designed to provide thermal-magnetic protection for industrial power distribution systems. It operates at a maximum voltage rating of 600V AC with a 10kA interrupting capacity at 600V, and features LI (Long-Time and Instantaneous) trip functions for precise overcurrent and short-circuit protection. The unit weighs 8 lb, utilizes a bolt-on connection for secure panel mounting, and is constructed for 3-phase applications. This breaker complies with industry standards for molded case circuit breakers, making it suitable for use in switchboards, panelboards, and motor control centers.

Key Features & Specifications
  • Type: Molded Case, 99 Series
  • Voltage Rating: 600V AC
  • Current Rating: 90A
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • AIC rating: 10kA@600V
  • Phase: 3
  • Functions: LI - Long-Time and Instantaneous
  • Weight: 8 lb


Product Identification
  • Manufacturer: Square D
  • Family: 99 Series
  • Type: 999