An interactive diagram of a typical three-circuit cabinet.

Learning Track · Module 1: The network · Step 2 of 101

Select a part to read what it does. Layouts differ by country and by maker. This is a typical arrangement, not a design.

Supply3P+N Mainisolator MeterkWh Mainbreaker SPDsurge MCB +RCD MCB +RCD MCB +RCD Contactor Contactor Contactor Controllerclock, meter, modem Photo Earth bar Out
Select a part

Each box is a part you will find in most cabinets. Dashed amber lines are control wiring from the controller to the contactor coils.

Sources

  1. IEC 61439-1 and -2 Low-voltage switchgear and controlgear assemblies
  2. IEC 60947-4-1 Contactors and motor-starters
  3. IEC 61643-11 Surge protective devices
  4. IEC 60364-7-714 External lighting installations

Changes: 30 October 2026: First publication: guides for Europe, the Middle East, South Asia, and the USA; failure library; tender clause library; comparisons; tools; downloads. See the changelog. Found a mistake? Report it.