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Protector 485 GEL 890460

protector-485 electro


  • Reliably protects the downstream hardware against damage due to an offset on the potential, e. g. in case of a lightning strike.
  • Uninterrupted availability of the communication with the protected device.
  • Quick to fit, as no additional cabling required.


  • The Protector 485 is a surge arrester for connection DSub connectors on an RS485 interface.
  • In case of offsets on the potential of up to 10 Veff AC (caused, e.g., by earth loops) the electronics are protected and communication is also maintained. As a result data transmission is not interrupted even under very difficult conditions.
    Only in case of offsets on the potential of more than 10 Veff AC (caused, e.g., by a lightning strike) is the communication interrupted for the duration of the interference while the electronics are fully protected.
  • Due to its compact design with a length of 34.6 mm, the Protector 485 is space saving.
  • The Protector 485 is fitted directly to the RS485 interface, preferably on the MotionController GEL 82xx, as an intermediate connector without further cabling. Due to the low series resistance in operation, a terminating resistor can be left in the device protected.


  • Electromagnetic immunity
    - Burst (as per EN 61000-4-4) 4.4 kV
    - Surge (as per EN 61000-4-5) > 1.25 kV
  • Protection against an offset on the potential
    - Up to 50 Veff AC
    Protection against damage to the electronics
    - Up to 10 Veff AC
    Maintenance of the communication
  • Speed of response in the nanosecond range
  • Series resistance approx. 10 Ohm (to be taken into account on designing the length of the communication cable)
  • Internal circuit designed for high pulse energies, caused by lightning strike

Fields of application

  • Wind power (onshore, nearshore, offshore)
  • Harsh industrial environment

Technical data, circuit diagram

Electrical data
Power supply Passive component
Electromagnetic immunity
   Burst (according EN 61000-4-4)
   Surge (according EN 61000-4-5)
> 4.4 kV
> 1.25 kV
Protection class IP 20
Serial interface RS 485
Connection D-sub connector
Ambient data
Operating temperature -40 ºC ... +85 ºC
Storage temperature -40 ºC ... +85 ºC
Condensation yes
Maximum atmospheric humidity 95%
Maximum operating altitude 3000 m
Vibration resistance acc. to DIN EN 60068-2-6 20 m/s2, 9 to 50 Hz
Mechanical data
Dimensions (W x D x H ) 34.6 mm x 21.8 mm x 18 mm
Weight < 40 g

Circuit diagram