High Current DC

Load Break Switches

DBM Range 1500VDC (13,5kA to 20kA)

For more than 100 years, Mersen has been providing the market with safe, reliable and longer life time on-load disconnectors.These devices offer high performances and robustness for heavy duty requierements 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 DBM High Current Load Break Switch product line is rigorously engineered to meet your technical specifications. Operation : They can be operated manually, with a pneumatic piston or with an adapted motor (see list) up to 50.000 cycles. Signaling, Terminal Box or Locking system can be studied and customized. Power breaking capacity up to 100kA - 100V DC - L/R< 20msec. (on demand) Acceptable ripple current at 2% 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%



  • On Load operation - Load and Make
  • Indoor Type - Horinzontal axis mounting
  • Configuration 1 pole disconnector
  • Mechanical endurance 50.000 cycles (with respect to maintenance instructions)
  • Connexion plates in Aluminium or Copper or mix (one side Copper, one side Aluminium)
  • Large customization possible with :
  • - connexion plate (length, fixing holes)
  • - Manual, motor or pneumatic drives
  • - auxilaries switches, blocking magnets, locking devices
  • - dimension fitting
  • Typical temperature rise at nominal current 15°K above busbar (with 40°Cmax.)
  • Temperature rise at nominal current is less than 65°K (with 40°C max. ambient temperature)
  • Visible break by direct seeing of the mobile silver-plated copper contacts
  • Mechanically independant mobile contact arms with high pressure springs
  • Electrical contact with silver to silver contact which offer high short-circuit current withstand and Low and constant voltage drop
  • Easy connections to Copper busbar by bolting or welding and self-supporting (Busbar must be sized to withstand the disconnector additionnal weight)
  • Large insulation and creepage distances using Fiberglass reiforced polyester insulators
  • Residual current breaking capacity 10 A - 1500 V DC
  • Power breaking capacity up to 50kA - 15 V DC - L/R < 20 msec (upon request)
  • Ponctual temperature withstand without equipment damages 140°C
  • Upon request, possible association of two devices on the same drive
  • Operation mechanism by a toggle closed system (bichromate galvanized steel)


  • Size per Standard DBM 13
    5kA to 20kA Aluminium or Copper type
  • Speed / Characteristic Around 1 sec with pneumatic operation 3 to 12 seconds with motor operation (depend on the rating)
  • Number of Poles 1
  • Standards IEC 60947-3 and IEC 60077-1
  • Application Power conversion Load Brake Switch.
  • ROHS Compliant Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • DBM 13,5 kA
  • DBM 18 kA
  • DBM 20 kA


Where to buy


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