Sediver Railways insulators

Sediver glass insulators for railway applications

Sediver is a key partner in all insulation applications with more than 2 million insulators operating today on numerous Railway networks with different applications and voltages such as

  • 15 kV and 25 kV on AC systems and
  • from 0.75 kV to 3 kV on DC systems

Since 1955, Sediver has been a supplier of catenary insulators to many railway companies. As a proof of good performance and reliable partnership, Sediver has been selected and qualified by S.N.C.F (France) as a supplier for the TGV – the French High Speed railway - which imposes very stringent safety criteria and reliability requirements.

Sediver glass railway insulators for East TGV Line – SNCF - France

Sediver main composite insulator railway references

for High speed lines

for traditional lines


France - South East TGV line

Belgium - SNCB


Denmark - DSB


Egypt - Metro of Cairo


France - Atlantic TGV line

France - SNCF


Germany - DB


Luxembourg - CFL


France - North TGV line

Morocco - ONCF


Norway - NSB


Portugal - CP


Korea - Seoul Pussan High speed track

Tunisia - MLT / MADLAA


Turkey - TCDD


United Kingdom - Eurotunnel line 1

United Kingdom - LCR


Sediver product range

With over 60 years of specialized experience in insulators, complemented by laboratory tests, Sediver can offer the safest and most reliable toughened glass insulators for railways which can be depended upon for their mechanical and electrical strength throughout their life.

Sediver studies and adapts its insulators and end fittings to the specifications of every railway company and project:

- Feeder insulators

Sediver glass railway feeder insulators

- Top tube insulators

Sediver glass strut and top insulators

- Strut tube insulators

Sediver glass railway strut and top insulators

The top and strut insulators are of a rigid construction, comprising three or four toughened glass shells connected by intermediate metal fittings. The toughened glass shells and metal fittings are assembled together using alumina cement, to give a bond which is stronger than the components themselves.