Pepperl+Fuchs isolated barrier Z787.H

Zener Barrier Z787.H

Pepperl+Fuchs isolated barrier Z787.H

Features
• 2-channel
• DC version, positive polarity
• Working voltage 26.5 V at 10 µA
• Series resistance max. 250 Ω
• Fuse rating 80 mA
• DIN rail mounting
• High power version
• With diode return


Function
The Zener Barrier Z787.H 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. Pepperl+Fuchs isolated barrier Z787.H
This high power version has a smaller serial resistance and therefore provides higher voltage to the field device.
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. Pepperl+Fuchs isolated barrier Z787.H
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.


Detailed Models
KFD2-SR2-Ex2.W
KFD2-SL2-Ex1
KFD2-SR2-Ex1.W
KFD2-STC4-Ex1
KFD2-SR2-EX.1.W.LB
KFD2-EB2.R4A.B
KFD2-SCD2-EX1.LK
KFD2-SR2-EX2.W
KFD2-SL2-EX2.B
KFD0-TT-EX1
KFD0-TR-EX1
KFD2-STC4-EX2
KFD2-UFC-EX1.D
KFD2-SCD2-EX2-LK
KFD2-CD-EX1.32-15
KFD2-STC4-EX1.2O
KFD2-SH-EX1.T.OP
KFD2-SR2-EX2.2S
KFD2-BR-1.PA.93
KFD2-UT2-EX2
KFD2-UFC-EX1.D
KFD0-SD2-EX1.1045
KFD2-SOT2-EX1.LB
KFD2-STC4-EX1.20
KFD2-STC4-1.20
KFD2-SCD2-EX2.LK
KFD2-SCD2-2.LK
KFD2-SH-EX1
KFD0-SD2-Ex2.1245
KFD2-SL2-Ex1.LK
KFD2-BR-Ex1.3PA.93
KFD2-CD2-EX2
KFD2-UT2-EX2
KFD2-STC4-EX1.2O
KFD2-CR4-1.2O
KFD2-CD2-EX1
KFD2-SL2-EX2
KLD2-PR-1.IEC
KFD2-WAC2-EX1.D
KFD2-UFT-EX2.D
KFD2-UFC-1.D
KFD-STC4-EX1.2O.DE
KFD2-SCD2-EX1
KFD2-PT2-Ex1
KFD2-SR2-EX2.2S
KFD0-SD2-EX1.1045
KCD2-E2L 
KCD2-STC-EX1
KFD2-SR2-EX1.W
KFD2-SCD2-EX1-LK
KCD2-SCD-EX1
KFD2-UT2-EX1
KFD2-VR4-EX1.26
KFD2-SR2-EX1.W.LB
KFDO-RSH-1
KFD2-GS-1.2W 
KFD2-EB.R4A.B
KFD0-SCS-EX1.55
KFD2-EX1.32
KFD2-STC4-Ex1-Y1.
KFD2-SR2-EX2.2S
KFD2-SCD2-EX2.LK
KFA5-SR2-EX1.W.LB
KFD2-RR-EX1
KFD2-SCD-EX1.LK
KFA6-STR-1.24.500
Z787.H
KFD0-CS-EX2.50P
KFD0-CS-EX2.51P
KFA6-SR2-EX1.W.LB
KFA5-SR2-EX1.W
KFD2-ST2-EX2
KFD2-DWB-1.D
KFD2-UT-EX1
KFD2-SR2-2.2S
HD2-FBPS-1.500
HD2-DM-B
KFD2-GU-Ex1.D
KFD2-PT2-EX1-5
KFD2-DWB-Ex1.D
KFA6-DWB-EX1.D
KFD2-STV4-EX2-2
Z728
Z828
KFD0-CS-Ex1.54P
KFU8-DW-1.D
KFD0-RO-Ex2
S1SD-1TI-1U
KFD2-GUT-1.D
KFD0-SCS-1.55
KFD2-DWB-Ex1.D
KFD2-PT2-EX1-5
KFA6-DWB-EX1.D
KFD2-STV4-EX2-2
Z728
Z828
KFD0-CS-Ex1.54P
KFD0-RO-Ex2
KFD2-GUT-1.D
KFD2-SCD2-1.LK
KFD2-GU-Ex1
Pepperl+Fuchs isolated barrier Z787.H