Intrinsically safe limiter cascade has internal limiter circuit, internal isolation arrangement and series device is conventional safety barrier or Zener barrier

摘要

The arrangement (7) has an internal limiter circuit, an internal isolation arrangement and is certified by a named agency. The series device consists of a conventional safety barrier or Zener barrier in accordance with DIN EN 50020. The safety barrier is not connected to the potential equalizer if the existing device (1) has a safe electrical isolation from the non-intrinsically safe connection.