High Voltage AC

Up to 3kV Disconnectors

Disconnectors FA range (0 to 175 Hz) (500 to 8 000Amp)

For more than 100 years, Mersen has been providing the market with safe, reliable and longer life time off-load disconnectors. These devices offer high performances and robustness for heavy duty requirements with very limited maintenance. Mersen offers one of the largest product ranges on the market and is the global leader. Mersen has a switch solution that will meet your unique needs. Our standard FA High Power Switches are rigorously engineered to meet your technical specifications. Operation : They can be operated manually or with an adapted motor (see list) up to 20.000 cycles. Phase to Phase distance, Signaling, Terminal Box or Locking system can be studied and customized. Maximum frequency up to 175Hz (above please consult) Indoor in a currentless state Ambient air should not exceed +40°C (otherwise please consult) Altitude should not exceed 1000 m Relative humidity should not exceed 95% List 1 following IEC 62271-1



  • No Load operation
  • Indoor Type - Non Magnetic and tropicalized equipment which can be installed in vertical or horizontal position
  • Change-over or disconnector configuration with 1 to 10 poles
  • Mechanical endurance : 20.000 cycles minimum warrantied for a device maintained according to the maintenance recommendations.
  • High short-circuit currents withstand
  • Electrical contact by connecting plates and movable contacts silvered copper entirely non-magnetic
  • Pressure of each rivet ensured by an individual spring in stainless steel.
  • Temperature rise at nominal current is less than 70°K (with 40°C max. ambient temperature)
  • Visible break by direct seeing of the mobile silver-plated copper contacts.
  • Large isolation air and creepage path.
  • Easy connections to Copper busbar by bolting and self-supporting (Busbar must be sized to withstand the disconnector additionnal weight).
  • Self-cleaning blade contacts, ideal for polluted environments.
  • True opening and visible distance.
  • Ponctual temperature withstand without equipment damages 140°C.
  • Full customisation with :
  • - Manual (handle or gear box), motor, pneumatic drives operation
  • - Quantity of Auxilary switches, safety blocking magnet, locking devices
  • - Dimensions of the disconnector and Fittings/connexions to the busbar.
  • Fixing flange in duralinox.


  • Size per Standard Disconnectors FA 500 to 6300 Amp for AC 500 to 8000 Amp for DC
  • Speed / Characteristic Around 1 sec with pneumatic operation 3 to 12 seconds with motor operation (depend on the rating)
  • Number of Poles Maximum 6 poles (for more please consult)
  • Standards IEC 60947-3, IEC 62271-102 and IEC 60694
  • Application Power conversion with the possible functions to disconnect, or to change-over or to earth the rectifiers or the drives.
    Fix traction sub-stations, isolating steel plants motors, for electrical and for rectifiers
    Isolating of installations needing a high short-circuit currents withstand
    Isolating of installations with polluted environments
  • ROHS Compliant Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • 1250A AC - 1250A DC
  • 2000A AC - 2000A DC
  • 2500A AC - 2800A DC
  • 3200A AC - 4000A DC
  • 4000A AC - 5000A DC
  • 5000A AC - 6300A DC
  • 500A AC - 500A DC
  • 6300A AC - 8000A DC


Where to buy


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