• Series
  • Model
  • Brand / Made in
  • 2-poles surge protector 48 Vdc
  • Type 1 and Type 2 application
  • In 25 kA / Imax 70 kA
  • Remote signaling
  • Iimp 25 kA
  • IEC 61643-11 and EN 61643-11 compliance
DC power networks are used in more and more applications and the threat of disturbances due to surge voltages must be taking in to account like for AC power lines.
DS250E-48DC surge protector is based on varistors matched to the network voltage 48Vdc, the varistors have thermal disconnection devices to control any end-of-life case. DS250E-48DC is designed to protect one line (+ or -), so need to combine two  DS250E-48DC to protect equipment connected to DC power supplies from lightning surges. 
DS250E-48DC is DIN rail compatible and is connected in parallel on the line to be protected.


  • SPD type: 1+2
  • Network: 48 Vdc
  • Nominal line voltage Un: 48 Vdc
  • Nominal DC voltage Un-dc: 48 Vdc
  • Max. DC operating voltage Uc: 75 Vdc
  • Residual Current Ipe: < 0.1 mA
  • Operating current Ic: < 0.1 mA
  • Follow current If: None
  • Nominal discharge current In: 25 kA
  • Max. discharge current Imax: 70 kA
  • Total Maximum discharge current    Imax Total: 140 kA
  • Impulse current by pole    Iimp: 25 kA
  • Specific energy by pole    W/R: 156 kJ/ohm
  • Connection mode(s): +/PE or -/PE
  • Protection mode(s): Common mode/Differential mode
  • Protection level +/PE (-/PE) Up: 500 V


  • Technology: MOV
  • SPD configuration: Single phase
  • Connection to Network: By screw terminals: 6-35mm² / by bus
  • Format: 1-pole modular box
  • Mounting: Symmetrical rail 35 mm (EN 60715)
  • Housing material: Thermoplastic UL94 V-0
  • Operating temperature: -40/+85°C
  • Protection rating: IP20
  • Failsafe mode: Disconnection from DC network
  • Disconnection indicator: 3 mechanical indicators
  • Remote signaling of disconnection: Output on changeover contact
  • Dimensions: See diagram


  • Standards compliance: IEC 61643-11 / EN 61643-11 / UL1449 ed.5
  • Certification: EAC


  • Thermal disconnector: Internal
  • Fuses: Fuses type gG - 315 A


DS250E-48DC surge protectors are connected in parallel on the DC network and must be equipped with external fuses for short-circuit current protection

  • The total length of parallel connection wires to DC network must be lower than 0.5 m in order not to increase the protection level (Up) provided by the SPD.
  • Wiring is made by screw connections. On some models, a distribution bus can be used.
  • The protection wire coming from the SPD must be connected to the bonding bar of the electrical panel. Paralleling the protection wire with phases conductors must be avoided.
  • Local earthing resistance must be in compliance with the electrical rules.

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