Welcome to the Schneider Electric Website

Welcome to our website.

You can choose another country to view available products or go to our Global website for company information.

Choose another country or region


    Sepam 3-winding differential protection

    Protection Relays for Protection of Networks and HV/MV Substations

    End of Commercialization

    High-performance protection relays for the protection of distribution systems and HV/MV substations

    Sepam 3-winding differential protection
    • Features

      Range of digital protection relays, ready-to-use, providing all the functions required by an application:

      • complete protection against internal transformer faults
      • restricted earth fault protection included
      • simple implementation due to the use of neural networks
      • metering
      • alarms and indication
      • control monitoring and diagnosis
      • communication

      Two applications:
      D32:three-winding differential protection for public and industrial distribution network.
      D31: three-winding differential protection for HV/MV substations.


      Simplicity and performance, headed in the right direction Protect your power system with full peace of mind using Sepam protection relays.

      • 20 years of experience in digital relays
      • A consistent range of relays organized according to applications


      Protection of a three-ended zone which includes a transformer, an auto-transformer or a generator-transformer unit.

      Success Stories

      Go Beyond Digitisation with Premset Live! App Features

      3D modelling and augmented reality can help you increase the efficiency, reliability and safety of your medium voltage assets, with Premset Live app! Learn more on Premset

      ECOFIT - Modernisation of Switchboards

      Modernisation offer refers to a partial or complete replacement of an old equipment by a new one. It aims to extend the electrical equipment’s life cycle and to enhance its availability and the operational reliability. Learn more on Ecofit