High Voltage

  • General information
  • Technical parameters
  • Tests
  • Service

Based on many years of experience in development and production of switching devices in the voltage levels from 72,5kV to 420kV, SERW is able to offer high-quality and reliable disconnectors and earthing switches in various versions. The basis for the quality and long lifetime of our products are our innovations, which we are able to perform in our company because of own development department. The switching devices installed all over the world can be operated even in demanding environmental conditions such as at the seaside, environment with at high temperature differences or heavy frosts.

We can offer this three designs of disconnectors:

  • Pantograph
  • Horizontal
  • Vertical

The main strengths of our switching devices:

  • Maintenance-free contacts
  • Stability when opening and closing thank to technological sophisticated construction
  • Solid construction with long service life

Depending on the use and customer requests there is single-, double- or three-phase version available. All versions of the disconnectors are available with earthing switch and equipped with a motor drive. The drives are mounted on special tables or directly on the frame.

Rated voltage






Rated current

     up to 6.300A

Rated short-time withstand current

 up to 63kA (1s)

Rated peak withstand current

 up to 160kA

Rated power-frequency withstand voltage 50 Hz, 1  min - to earth 140kV 230kV 275kV 460kV 520kV
Rated power-frequency withstand voltage 50 Hz, 1 min - accross open disconnector 160kV 265kV 315kV 530kV 610kV
Rated lightning impulse withstand voltage 1,2/50µs - to earth 325kV 550kV 650kV 1050kV 1425kV
Rated lightning impulse withstand voltage 1,2/50µs - accross open disconnector 375kV 630kV 750kV 1200kV 1425 (+240)kV
All our products are produced according to the norm IEC 62271-102. We ensure our quality with the quality management system ISO 9001.
Besides standard products SERW can also rebuild or overhaul devices of discontinued product lines of 3rd party manufacturers. On demand SERW provides measurement of the existing substations to propose project specific solutions. After the installation of our switching devices we take quick service and delivery of spare parts for granted.

  • General information:

  • Contacts:

    Pavel Chaluš

    Director Sales
    T +420 377 965 057
    This email address is being protected from spambots. You need JavaScript enabled to view it.

  • References:

    Wesernetz Bremen GmbH
    Avacon Netz GmbH
    Bayernwerk Netz GmbH
    Schleswig-Holstein Netz AG
    E.DIS Netz GmbH
    ČEZ, a. s.

  • Přílohy:

    Download - Technical documents

a company of RS Group