E-Plex Digital Solutions

E-Plex 821BD Dual Blocking Diode

When an E-Plex power module such as an 805OPM is used to power a load and that load may also be powered from another power source, a potentially damaging back feed situation is possible. The 821BD can be used to prevent the back feed from causing any damage, whilst still allowing the E-Plex module to detect if the auxiliary supply is active.

Key Features

  • Two independent channels
  • 5 A continuously rated
  • 20 A surge capability
  • Integrated back EMF protection diode
  • Din rail mountable


  • Controlling / monitoring bilge pumps
  • Redundant power supplies
E-Plex 821BD Dual Blocking Diode