Serviceline Industrial Sensors
Serviceline Explosion Protection

Zener Barrier Z779.H.F

  • 2-channel
  • DC version, positive polarity
  • Working voltage 26.5 V at 10 µA
  • Series resistance max. 273 Ω
  • Fuse rating 50 mA
  • DIN rail mounting
  • High power version
  • Replaceable back-up fuse

Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of  Z779.H.F

General specifications
TypeDC version, positive polarity
Electrical specifications
Nominal resistance240 Ω
Series resistancemax. 273 Ω
Fuse rating50 mA
Hazardous area connection
Connectionterminals 1, 2; 3, 4
Safe area connection
Connectionterminals 5, 6; 7, 8
Working voltage
Supply loopmax. 27 V
Measurement loopmax. 26.5 V at 10 µA
Degree of protectionIEC 60529
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °F)
Storage temperature-25 ... 70 °C (-13 ... 158 °F)
Relative humiditymax. 75 % , without condensation
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals
Core cross-sectionmax. 2 x 2.5 mm2
Massapprox. 150 g
Dimensions12.5 x 115 x 110 mm (0.5 x 4.5 x 4.3 inch)
Construction typemodular terminal housing , see system description
Mountingon 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
EU-type examination certificateBAS 00 ATEX 7096
MarkingEx-Hexagon II (1)GD, [Ex ia Ga] IIC, [Ex ia Da] IIIC, (-20 °C ≤ Tamb ≤ 60 °C) [circuit(s) in zone 0/1/2]
Voltage28 V
Current120 mA
Power830 mW
Maximum safe voltage250 V
Series resistancemin. 235 Ω
CertificateTÜV 99 ATEX 1484 X
MarkingEx-Hexagon II 3G Ex nA II T4 [device in zone 2]
Directive conformity
Directive 2014/34/EUEN 60079-0:2012+A11:2013 , EN 60079-11:2012 , EN 60079-15:2010
International approvals
FM approval
Control drawing116-0118
UL approval
Control drawing116-0355 (cULus)
IECEx approval
IECEx certificateIECEx BAS 18.0033
IECEx marking[Ex ia Ga] IIC , [Ex ia Da] IIIC , [Ex ia Ma] I
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see


ECLASS 10.0.127219001
ECLASS 9.027219001
ECLASS 8.027219001
ECLASS 5.127210702
ETIM 8.0EC001485
ETIM 7.0EC001485
ETIM 6.0EC001485
ETIM 5.0EC002653
UNSPSC 12.139121018

Documents: Z779.H.F

ManualsLanguageFile TypeFile Size
Manual Zener Barriers Z-SystemENGPDF1203 KB
Handbuch Zenerbarrieren Z-SystemGERPDF1203 KB
Instruction manuals
Návod k poużitíCZEPDF195 KB
Instruktions manualDANPDF194 KB
Instruction manualENGPDF68 KB
KasutusjuhendESTPDF190 KB
KäyttöohjeFINPDF191 KB
Manuel d'instructionsFRAPDF136 KB
BetriebsanleitungGERPDF69 KB
Οδηγίες χρήσηςGREPDF205 KB
HandleidingHOLPDF196 KB
Instruction manual / BetriebsanleitungHRVPDF194 KB
Manuale di istruzioniITAPDF69 KB
Lietošanas pamācībaLAVPDF194 KB
Instrukciju vadovasLITPDF0 KB
Instrukcja obsługiPOLPDF0 KB
Manual de instruçõesPORPDF196 KB
Manual de utilizareRONPDF196 KB
Návod na poużitieSLKPDF0 KB
Navodila za uporaboSLVPDF192 KB
Manual de instruccionesSPAPDF133 KB
ManualSWEPDF192 KB

Approvals+Certificates: Z779.H.F

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0061DPDF93 KB
Baseefa IECEx ia IECEx Certificate of ConformityIECEx BAS 18.0033LINK---
Brasil TUV Rheinland BrazilTÜV 14.0362PDF584 KB
Canada UL cULE106378 cUL (QVAJ7)LINK---
Canada UL cULE106378 cUL (QUZW7)LINK---
EAC Lenpromexpertiza (LPE) EAC TP TC 012/2011EAEC RU C-DE.AA71.B.00100/19PDF6852 KB
Europe Baseefa II (1) D II (1) G I (M1) ATEXBAS 00 ATEX 7096PDF5273 KB
Europe TUV Nord II 3 G ATEX Category 3 GTÜV 99 ATEX 1484XPDF1460 KB
USA Canada UL Hazardous Location Certificate of Compliance cULus UL E106378CoC 20131125 - E106378 RepRef 20131122PDF259 KB
USA FMFM 17 US 0370PDF416 KB
Worldwide Pepperl+Fuchs Functional Safety AssessmentCERT-5207PDF575 KB
Control drawings
Control Drawing UL / Control Drawing UL   PDF92 KB
Control drawing FM / Control drawing FM   PDF167 KB

Function: Z779.H.F

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. This high power version has a smaller serial resistance and therefore provides higher voltage to the field device.

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.