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  • Brand / Made in
  • Description: 1-pair monobloc Telecom surge protector
  • Network: RS232, RS485
  • Monobloc housing and very compact
  • For 'DIN' rail mounting
  • SPD configuration: 1-pair+shielded
  • Max. DC operating voltage: 15 Vdc
  • Max. discharge current : 10 kA
  • IEC 61643-21 / EN 61643-21 / UL497A compliance


DLC compact surge protective devices (SPDs) are designed to protect terminal equipment connected to industrial buses, telecommunication lines or signalling applications from the effects of lightning and transient overvoltages. These SPDs are installed on symmetrical DIN rail, often within customer panels. DLC SPDs protect 1-pair applications and have a non-pluggable (monobloc) enclosure. Many types are available to cover most applications. D2 types are best suited to floating applications, D3 types offer full-mode protection across all lines with D3G types additionally providing specific protection for the signalling ground wire.

Cấu tạo kích thước và mạch bảo vệ của DLC-12D3



  • Network: RS232, RS485
  • Nominal line voltage Un: 12 V
  • Max. DC operating voltage Uc: 15 Vdc
  • Max. load current IL: 300 mA
  • Max. frequency f max.: > 3 MHz
  • Insertion loss: < 1dB
  • Max. discharge current Imax: 10 kA
  • Protection mode(s): Common/Differential mode
  • Protection level Up: 30 V (L/L), 20 V (L/PE)
  • Impulse current Iimp: 2.5 kA
  • Nominal discharge current In: 5 kA
  • Line resistance: < 4.7 ohm


  • Technology: GDT+Clamping diode
  • SPD configuration: 1-pair+shielded
  • Connection to Network: by spring - max. cross section 1.5 mm²
  • Format: DIN box
  • Mounting: Symmetrical rail 35 mm (EN 60715)
  • Housing material: Thermoplastic UL94 V-0
  • Protection rating: IP20
  • Failsafe mode: Short-circuit - transmision cut-off - fault mode 2
  • Disconnection indicator: Transmission interrupt


  • Standards compliance: IEC 61643-21 / EN 61643-21 / UL497A
  • Certification: UL listed


  • DLC-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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