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C3 Controls 320-B4U57 - Overload Relay 57A (600V AC)

C3 Controls
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C3 Controls 320-B4U57 is a thermal overload relay designed to provide reliable motor protection by monitoring current and tripping to prevent damage from overloads or phase failure. It is rated for a maximum operational voltage of 600V AC and a current range typically up to 57 amps, housed in a robust, compact enclosure for durable performance in demanding environments. This relay complies with relevant industrial standards for safety and interoperability, ensuring suitability for integration into motor control centers and starter assemblies. Its primary application is safeguarding three-phase AC motors in industrial settings such as manufacturing plants, HVAC systems, and material handling equipment.

Key Features & Specifications
  • Type: Thermal overload relay with manual/automatic reset, bi-metallic trip mechanism
  • Voltage Rating: 600V AC
  • Current Rating: 57 A (adjustable range)
  • Dimensions: Compact design for standard starter mounting
  • Standards: Complies with UL, CSA, and IEC standards
  • Applications: Protection of three-phase AC motors in industrial control panels, pumps, fans, and conveyors
  • Item Subcategory: Overload Relay
  • Weight: 5 lb


Product Identification
  • Manufacturer: C3 Controls
  • Model: 320-B4U57