زنربریر مدل Z787.F

Feature

2Channel
 DC version, positive polarity*
 Working voltage 26.5 V at 10 μA*
 Series resistance max. 341 Ω*
Fuse rating 50mA*
DIN rail mounting*
 Replaceable back-up fuse*
 With diode return*

:Function
The Zener Barrier prevents the transfer of unacceptably high
.energy from the safe area into the hazardous area
The zener diodes in the Zener Barrier are connected in the
reverse direction. The breakdown voltage of the diodes is not
exceeded in normal operation. If this voltage is exceeded, due
to a fault in the safe area, the diodes start to conduct, causing
.the fuse to blow. The Zener Barrier has a positive polarity, i. e
.the anodes of the zener diodes are grounded
Additionally this Zener Barrier is equipped with a replaceable
.fuse
The Zener Barrier is for evaluation of signals from the
hazardous area. The diodes of diode return prevent a current
into the hazardous area, therefore the current assumption for
.intrinsic safety calculations is zero
Depending on the application, increased or decreased
intrinsic safety parameters apply for serial or parallel
connection. For the detailed parameters refer to the Zener
Barrier certificate. Application examples can be found in the
.system description of the Zener Barriers