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Siemens 3UA50-00-1B - Overload Relay 1.25-2A (Solid State)

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Siemens 3UA50-00-1B is a thermal delayed overload relay from the World Series family, designed to protect motors against overloads and short circuits in industrial control applications. It features a solid-state relay style with an adjustable current range of 1.25 to 2.0 Amperes and a maximum voltage rating of 690V. The relay weighs 1 lb and is constructed for direct mounting onto Siemens contactors and motor starters, including models 3TF30, 3TF31, 3TF40, 3TF41, 3TB40, and 3TB41. It complies with industry standards for motor protection and includes 1NO + 1NC auxiliary contacts for integration into control circuits. This overload relay is typically used in industrial motor control panels and automation systems requiring reliable thermal overload protection.

Key Features & Specifications
  • Type: Thermal Delayed Overload Relay
  • Relay Style: Solid State
  • Family: World Series
  • Amperage Minimum: 1.25
  • Amperage Maximum: 2
  • Maximum Voltage: 690V
  • Weight: 1 lb
  • Mounting: Direct mounting onto contactors and starters
  • Contacts: 1NO + 1NC auxiliary contacts
  • Protection: Motor overload and short circuit protection


Part Number: 3UA50-00-1B