Great prices on RS422 RS-485 lightning surge protection for modems, terminals and converters


Model 22NX - RS-422 and RS-485 Lightning/Surge Protector

  • Triple Stage Protection
  • Fast Response Time For RS-422 / RS-485
  • Prevents Damage to Modems, Converters, and Terminals
  • Accommodates Data Rates to 10 MBPS
  • Supports 4 Circuits

Product Description

High voltage transients caused by lightning or other electrical disturbances have the ability to easily destroy semiconductor junctions, and thus, cause equipment failure. A lightning strike in the vicinity of data lines can cause induced ground currents which can also do serious damage. Typical leading edge wave-fronts of a lightning strike rise at the rate of 1,000 Volts per microsecond. The Model 22NX Lightning Sponge is designed to accommodate these transients, slow them down and redirect them to a low impedance path to earth ground.

RS-422/RS-485 is a low voltage, high speed interface. Protection of these RS-422/RS-485 lines is accomplished by using the 4-wire Model 22NX. It limits the voltage to approximately 7.5 Volts and passes signals whose data transfer rate can exceed ten million bits per second. The protection circuits incorporate 3 separate stages of limiting high voltage transients, gas tubes and two stages of avalanche diodes. The DC series resistance is limited to approximately 5 Ohms and the response time is measured in nanoseconds. It is good practice to install a Model 22NX on each end of the 4-wire transmission line. The output voltage is limited to ±7.5 volts for the Model 22NX.The Model 22NX provides 4-wire screw terminals on both ends for terminating the 4-wire lines. An additional screw terminal is provided to make the connection to earth ground. This wire should be at least #12 gauge or larger and be as short as possible. It will conduct the surge to earth ground (power ground or water pipe).

Model Description Product Info Place an Order
22NX RS-422 and RS-485 Lightning/Surge Protector

Specifications Manual Application Note