Reference price :
Contact us
  • Series
  • Model
  • Brand / Made in
  • D-sub dataline surge protector
  • Network: RS232, RS485, 4-20mA
  • SPD configuration: 9 wires, 9-pin connector
  • Max. DC operating voltage: 40 Vdc
  • Max. discharge current: 20 kA
  • Fast and easy installation
  • Standards compliance: IEC 61643-21 / EN 61643-21 / UL497B
  • Certification: UL listed


These surge protectors are designed to protect sensitive equipment linked to datalines equipped with D-Sub connectors, as RS232, RS422 and RS485 lines.
They protect against surge voltages due to lightning or switching operations. They are equipped with D-sud connectors for fast and easy maintenance. In order to comply with the line configuration, all the wires are transmitted and protected. Available 9, 15 and 25-Pin D-Sub Connectors versions.
The surge protection diagram is based on ultra-fast clamping diodes in to reach an high level of efficiency. Nevertheless, their low discharge capability make them usable only to protect indoor transmission lines.


DD9-24V diagram

                 D: Clamping diode




  • Network: RS232, RS485, 4-20mA
  • Nominal line voltage Un: 24 V
  • Max. DC operating voltage Uc: 40 Vdc
  • Max. frequency f max.: > 10 MHz
  • Max. data rate: < 40 Mbps
  • Insertion loss: < 1 dB
  • Max. load current IL: 750 mA
  • Nominal discharge currentC2 Category In: 5 kA
  • Line/Line Nominal discharge current C2 Category In L/L: 300 A
  • Line/Ground Nominal discharge current 8/20µs Test x 10 - C2 Category In L/PE: 300 A
  • Max. discharge current max. withstand @ 8/20µs by pole Imax: 20 kA
  • Total Maximum discharge current max. total withstand @ 8/20µs Imax total: 20 kA
  • Impulse current2 x 10/350µs Test - D1 Category Iimp: 2.5 kA 
  • Line inductance: no
  • Protection mode(s): Common/Differential mode
  • Protection level Following the test category  C3 (IEC61643-21) - L/L Up: 18 V (L/L), 20 V (L/PE)  
  • Max. capacitance: < 30 pF
  • Line resistance: < 4.7 ohm


  • Technology: electrode diode
  • SPD configuration: 9 wires
  • Connection to Network: D-Sub 9 pts male/female Input/output
  • Format: In/out D-Sub connector unit
  • Mounting: On cable
  • Housing material: Thermoplastic UL94 V-0
  • Protection rating: IP20
  • Outdoor application: no
  • Failsafe mode: Short-circuit - transmision cut-off - fault mode 2
  • Disconnection indicator: Transmission interrupt
  • Spare module(s): S480-24D3
  • Remote signaling of disconnection: no
  • Pinout: all wires transmitted and protected


  • Standards compliance: IEC 61643-21 / EN 61643-21 / UL497B
  • Certification: UL listed


  • DD9-24V 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.
  • 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.


No products in your cart
Báo Giá Sản Phẩm