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  • Series
  • Model
  • Brand / Made in
  • 1-pair DIN rail plug-in Data surge protector
  • Network: RS232, RS485
  • SPD configuration: 1-pair+shielded
  • Up to 2,4 A line current
  • Max. DC operating voltage: 15 Vdc
  • Max. discharge current : 20 kA
  • IEC 61643-21 /UL 497A compliance

DLAH series

DLAH surge protectors are designed to protect, against surge voltages due to lightning, terminals equipment connected to industrial buses, telecom lines or datalines.

These surge protectors must be installed on symmetrical DIN rail and are available for most of the transmission lines: line voltage from 6 to 170 V, bitrate up to 10Mbit/s and up to 2,4 A line current.

Electrical diagrams are built with gas tubes and fast clamping diodes in order to provide high discharge current capability and fast operation.

These products are 1-pair surge protectors with removable module for easy maintenance (spare module: P/N: DLAHM...). Transmission and protection of the shield wire by gas tube. Direct earthing through DIN rail. Line continuity in case of plug-in module removal.


  • Network: RS232, RS485
  • Nominal line voltage Un: 12 V
  • Max. DC operating voltage Uc: 15 Vdc
  • Max. frequency fmax.: > 3 MHz
  • Insertion loss: < 1 dB
  • Max. load current IL: 2,4 A
  • Max. discharge current Imax: 20 kA
  • Line inductance: 10uH
  • Protection level Up: 30 V (L/L), 20 V (L/PE)
  • Impulse current Iimp: 5 kA
  • Nominal discharge current In: 5 kA
  • Line resistance: 0 ohm


  • Technology: GDT+Clamping diode
  • SPD configuration: 1-pair+shielded
  • Connection to Network: By screw terminal: cross section 0.4-1.5mm²
  • Mounting: Symmetrical rail 35 mm (EN 60715)
  • Housing material: Thermoplastic UL94 V-0
  • Operating temperature: -40/+85°C
  • Protection rating: IP20
  • Failsafe mode: Short-circuit
  • Disconnection indicator: Transmission interrupt - default mode 2
  • Spare module(s): DLAHM-12D3


  • Standards compliance: IEC 61643-21 / EN 61643-21 / UL497A


  • DLAH-12D3 surge protectors are connected in serial on the network. 
  • The protected equipment must be nearby (protector/equipment distance less than 10 m long). If this rule cannot be followed, «secondary» protection must be installed near the equipment (coordinated surge protection).
  • The total length connection wires to 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. 
  • The protection wire coming from the SPD must be connected to the bonding bar of the electrical panel. 
  • Local earthing resistance must be in compliance with the electrical rules.


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