Status: Need is Closed

High temperature arc resistant coating/material

Request Number

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Need was closed on
May 23, 2019

Siemens is seeking an electroconductive material/coating that is resistant to electrical arcs.


During a high current/voltage switching operation an electrical arc occurs. These arcs can cause functional failures of the electrical system. 

In the event of switching the solution needs to prevent the evaporation/damage of the contact areas (see picture) through electrical arcs.

The three-position switch-disconnector is used in a three-phase gas-insulated, metal-enclosed, medium-voltage switchgear acc. to Norm IEC 62271-1-200.
The switch has the functions switch-disconnector and make-proof earthing switch.


Key success Criteria


These criteria are essential for success:

  • High temperature resistant coating of electrolytic copper.
  • The coating/material has to be electroconductive.
  • Defined coating adhesion strength necessary.
  • After heat input, a damage/evaporation of the coating/material is permitted.
  • Test Voltage 38 kV.
  • Number of short-circuit making operations /Classification n=5.
  • Short-circuit making current of Ima 60 Hz up to kA 65.
  • Number of mechanical operating cycles (CLOSED-OPEN-EARTHED-OPEN-CLOSED) with no-load n=1000.

From our experience, the following criteria are recommended (high probability that these criteria need to be fulfilled):

  • Roughness max. Rz10
  • Hardness ~85 HBW 2,5/62,5
  • The mechanical load must not cause a detachment of the coating.
Possible Approaches

Siemens is open to all solutions that meet the success criteria.

Due Date
May 17, 2019
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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Dezarae Carver
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