Global site

ABB's website uses cookies. By staying here you are agreeing to our use of cookies. Learn more

ESP RS485, RS485Q & SL RS485 Series

The ESP RS485, RS485Q & SL RS485 Series is a Combined Category D, C, B tested protector (to BS EN 61643) specifically designed for RS 485 and Fieldbus applications, such as Profibus DP. For use at boundaries up to LPZ 0 protect against flashover (typically the service entrance location) through to LPZ 3.

Available as standard ESP RS485 format, or compact ESP RS485Q and Slim Line ESP SL RS485 versions for installations where a high number of lines require protection.

Features & benefits

  • Very low let-through voltage (enhanced protection to IEC/BS EN 62305) between all lines
  • Full Mode design capable of handling partial lightning currents as well as allowing continual operation of protected equipment
  • Repeated protection in lightning intense environments
  • 45 MHz bandwidth greatly exceeds 12 Mbps maximum speeds
  • Low in-line resistance minimizes reductions in signal strength
  • Suitable for earthed or isolated screen systems
  • Built-in DIN rail foot for simple mounting to top hat DIN rails
  • Convenient earthing through DIN foot and/or earth terminal
  • Connect screen connection 'S' as the 0V ground on RS485 systems
  • ESP RS485 can be flat mounted on base or side
  • ESP RS485 and ESP RS485Q have colour coded terminals for quick and easy installation check
  • ESP SL RS485 has ultra slim 7 mm width ideal for compact protection of large numbers of lines (e.g. process control installations)
  • ESP SL RS485 includes two stage removable protection module with simple quick release mechanism allowing partial removal for easy line commissioning and maintenance as well as full removal for protection replacement
  • ESP SL RS485 includes optional LED status indication. Add L suffix to part number - i.e. ESP SL RS485L
  • ESP RS485Q available with Push Terminals (ESP RTDQ/PT) for simple 'spring' connections, to provide fast and reliable cable termination
  • ESP RS485Q and ESP RS485Q/PT have UL497b approval under file E240341