Status: Need is Closed

Alternative Material for Protection against Electrical Arcs

Request Number

Point of Contact
Need was closed on
May 23

Siemens is searching for an alternative solution for protection against the burning through of an electrical arc. The solution is needed in the vessel of a metal-enclosed and SF6-gas-insulated switchgear.


The primary part of a gas-insulated switchgear consists of a stainless steel vessel filled with SF6 gas. The gas serves as an insulator in order to achieve the narrowest and most compact design.

The picture below shows an example of a vessel with the three busbars (phase L1, L2, L3) and arc-fault additives. Currently, the arc-fault additive consists of a metal and a protection sheet.



Picture 1: Gas-filled vessel with busbar system and protection against arc-fault (Example of one application)  

In the event of a failure, the sheet metal serves to guide the electrical arc (5000 – 10000 °C) in a targeted manner. Due to the limited space in the container, the sheet metal is located close to the vessel wall.
To prevent the arc from burning out of the container in the event of a failure, a new material (as an economical alternative for the current solution) is required for protection.

The installation situation is shown in pictures 1 and 2.




Picture 2: Example for the need for protection against burning through of an electrical arc

10 tons insulating material per year are needed for the current solution.

Key success Criteria
  • Electrically insulating material.
  • Resistant to an electrical arc lasting maximum 1 second (material must not be burned (through)).
  • Needed space ≤ 2,0 mm (dimensionally stable material), between sheet metal and vessel wall.
  • Operating temperature -40 °C to +70 °C.
  • Service life of 30 years (no maintenance).
Possible Approaches

Siemens is open to all solutions that meet the success criteria and are ready for production within maximum one year.

Siemens is open to solutions which include an alternative material (further processing at Siemens, e.g. plastic fibre plates) or completed, ready-to-install components.

Due Date
May 16
Items to be submitted

We are looking for concise, non-confidential proposals. The proposal should:

  • Describe the technical approach
  • Provide information on the performance of the technology (if available)
  • Include a description of the responding organisation or team and their experience.

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Gallery Moderator(s)
Dezarae Carver
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