• General information
  • Technical parameter
  • Tests
  • Service

Disconnectors with low switching capacity show visible disconnection between two circuits in the network. They are produced for indoor and outdoor substations.

In order to keep workload at a minimum in course of replacement projects in existing substations, SERW can supply disconnectors with exactly the connection points of the installed devices. All our disconnectors can also be equipped with earthing switches.

The main strengths of our disconnectors:

  • Maintenance-free
  • Special solutions for high current load up to 10.000 A are available
  • Knife type construction
  • Single-, double- and three-pole version
  • Earthing switch available as an option

The drives of our devices are mounted directly on the frame, on a special table or on the front of the cell. Project-specific design after consultation.

Rated voltage






Rated current

    up to 10.000A

Rated short-time withstand current

 16 to 80kA (1s)

Rated peak withstand current

 40 to 200kA

Rated power-frequency withstand voltage 50 Hz, 1 min - to earth 10kV 20kV 28kV 50kV 70kV
Rated power-frequency withstand voltage 50 Hz, 1 min - accross open disconnector 12kV 23kV 32kV 60kV 80kV
Rated lightning impulse withstand voltage1,2/50µs - to earth 40kV 60kV 75kV 125kV 170kV
Rated lightning impulse withstand voltage 1,2/50µs - accross open disconnector 46kV 70kV 85kV 145kV 195kV

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:

    Skupina ČEZ a. s.
    ENGIE Services a.s.

  • Přílohy:

    Download - Technical documents

Medium Voltage - Outdoor disconnectors Outdoor design

Medium Voltage - Indoor disconnectors Indoor design

a company of RS Group