ABB E320DU Electronic Overload Relay

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• 1. Product Description

  The ABB E320DU Electronic Overload Relay is designed to provide accurate and reliable overload and phase-loss protection for three-phase AC induction motors. Using electronic sensing technology, it offers a wide adjustable current range and selectable trip classes to suit various motor starting and operating conditions. The E320DU is self-powered and does not require an external auxiliary supply, allowing direct mounting with ABB contactors for compact and efficient motor protection solutions.

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  2. Technical Specifications

  • Model: ABB E320DU

  • Type: Electronic Overload Relay

  • Motor Type: Three-phase AC induction motors

  • Current Setting Range: 100 A to 320 A (depending on model)

  • Trip Classes: Selectable 10E / 20E / 30E

  • Number of Poles: 3

  • Rated Operational Voltage (Ue): Up to 690 V AC

  • Rated Insulation Voltage (Ui): 690 V AC

  • Rated Impulse Withstand Voltage (Uimp): 6 kV

  • Auxiliary Contacts: 1 NO + 1 NC

  • Reset Mode: Manual or Automatic

  • Power Supply: Self-powered

  • Ambient Temperature Range: -25 °C to +70 °C (temperature compensated)

  • Degree of Protection: IP20

  • Mounting: Direct mounting onto ABB contactors

  • Functions: Overload protection, phase-loss protection, trip indication, test and stop functions

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  3. Advantages and Features

  • High-precision electronic protection ensuring stable and accurate motor protection.

  • Wide adjustable current range reducing the need for multiple relay models.

  • Selectable trip classes suitable for different motor loads and starting times.

  • Self-powered operation eliminating the need for external control power.

  • Fast phase-loss detection to prevent severe motor damage.

  • Perfect integration with ABB contactors for compact motor starter assemblies.

  • Temperature compensation maintaining reliable performance under varying ambient conditions.

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  4. Typical Applications

  • Overload and phase-loss protection for three-phase motors

  • Industrial automation systems

  • Drives for pumps, fans, compressors, and conveyors

  • Machinery in manufacturing, mining, metal, and chemical industries

  • Motor protection circuits in control panels and distribution boards

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  5. Precautions

  • Set the current according to the motor’s rated current to ensure proper protection.

  • Follow wiring instructions carefully during installation.

  • Always disconnect power before adjusting current settings or trip class.

  • Additional protection is recommended for harsh environments such as high humidity or heavy dust.

  • Not suitable for DC motors or single-phase motor applications.

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The structure and details of the product：

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