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Home / Technical Articles / 4 crucial devices used for distribution system protection (selection and installation tips)

Protection of distribution networks

A wide variety of equipment is used to protect distribution networks. The particular type of protection used depends on the system element being protected and the system voltage level. And even though there are no specific standards for the overall protection of distribution networks, some general indication of how these systems work can be made.

4 crucial devices used for distribution system protection (selection and installation tips)
4 crucial devices used for distribution system protection - selection and installation tips (on photo: protection relay type SEL421; credit:

The devices most used for distribution system protection are:

  1. Overcurrent relays
    1. Definite-current relays
    2. Definite-time/current or definite-time relays
    3. Inverse-time relays
  2. Reclosers
  3. Sectionalisers
  4. Fuses

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Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

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