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Square D AR139 - Thermal Overload Heater Unit 5.19 lb (AR1.39 Series)

Square D
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Square D AR139 is a thermal overload heater unit designed for motor protection, serving as a replacement thermal element in compatible Square D overload relays. This unit provides reliable overcurrent protection by responding to excessive heat caused by motor overloads, ensuring consistent performance in industrial motor circuits. The component weighs 5.19 lb and is constructed as a direct replacement part for the AR1.39 series overload relays. It complies with standard industry requirements for thermal overload protection in motor control applications. Typical applications include protecting motors in manufacturing, pumping, and material handling systems.

Key Features & Specifications
  • Type: Thermal Overload Heater Unit
  • Manufacturer: Square D
  • Weight: 5.19 lb
  • Series/Frame: AR1.39
  • Part Number: AR139 (AR1.39)
  • Application: Motor protection, overload relay replacement
  • Trip Unit: Thermal element