On Board Disconnector Switch

1500VDC On Board Disconnectors Switch

Disconnectors FA range 1500VDC 250 to 2000Amp

For more than 100 years, Mersen have 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 for On-Board applications under 85VDC, 750VDC, 1,500VDC, 3,000VDC and 25kVAC. Mersen has a switch solution that will meet your unique needs. Our standard On-Board FA disconnector range is rigorously engineered to meet your technical specifications in different configurations (Disconnector, Change-over, earthing). Operation : They can be operated manually or with an adapted motor (see list) up to 25.000 cycles. Phase to Phase distance, Signaling, Terminal Box or Locking system can be studied and customised. Indoor use in a currentless state



  • No Load operation
  • Indoor Type equipment non magnetic equipment which can be installed in vertical or horizontal position
  • This technology offer various configurations
  • - Disconnector or Change-over or Earthing
  • - 1 to 4 different positions (Power, Earth, Work shop, other)
  • - 1 to 6 poles offering different ratings (1 x 1250; 3 x 250 Amp)
  • - Quick acting operation (using spring tumbler)
  • - manual or motorized operation
  • - with or without micro switches
  • - with or without locking system
  • Mechanical endurance : 25.000 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
  • Pressure of each rivet ensured by an individual spring in stainless steel.
  • Temperature rise at nominal current is less than 40°K (with 70°C max. ambient temperature)
  • Visible break by direct seeing of the mobile silver-plated copper contacts.
  • Large isolation air and creepage distance.
  • Easy connections to Copper busbar by bolting and self-supporting.
  • Self-cleaning blade contacts, ideal for polluted environments.


  • Size per Standard On Board Disconnectors FA 250 to 2000 Amp for DC under 1500VDC
  • Speed / Characteristic Around 5 seconds with motor operation (depend on configuration)
  • Number of Poles 1 to 6 poles with same or different current ratings (for more poles please consult)
  • Standards IEC 60077-1
    IEC 60077-2
    IEC 61373
    EN 50124
  • Application Traction circuit configuration change in multi-system locos (e.g. 750VDC/ 1500VDC)
    Isolation of Power Converter and traction motors
    Power control with the possible functions to disconnect, to change-over or to earth the power source of rolling stock applications (Train, Tramway, Metro)
  • ROHS Compliant Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • 1250 Amp 1500 VDC
  • 2000 Amp 1500 VDC
  • 250 Amp 1500 VDC
  • 500 Amp 1500 VDC
  • 800 Amp 1500 VDC


Where to buy


© 2022 Mersen S.A. All rights reserved.