Serviceline Industrial Sensors
Serviceline Explosion Protection

Zener Barrier Z728

  • 1-channel
  • DC version, positive polarity
  • Working voltage 26.5 V at 10 µA
  • Series resistance max. 327 Ω
  • Fuse rating 50 mA
  • DIN rail mountable

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  Z728

General specifications
TypeDC version, positive polarity
Electrical specifications
Nominal resistance300 Ω
Series resistancemax. 327 Ω
Fuse rating50 mA
Hazardous area connection
Connectionterminals 1, 2
Safe area connection
Connectionterminals 7, 8
Working voltage
Supply loopmax. 26.9 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 116 mm (0.5 x 4.5 x 4.6 inch) (W x H x D)
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 01 ATEX 7005
MarkingEx-Hexagon II (1)GD, I (M1) [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I (-20 °C ≤ Tamb ≤ 60 °C) [circuit(s) in zone 0/1/2]
Voltage28 V
Current93 mA
Power650 mW
Maximum safe voltage250 V
Series resistancemin. 301 Ω
CertificateTÜV 99 ATEX 1484 X
MarkingEx-Hexagon II 3G Ex nA IIC T4 Gc [device in zone 2]
Directive conformity
Directive 2014/34/EUEN IEC 60079-0:2018+AC:2020 , EN 60079-11:2012 , EN 60079-15:2010
International approvals
FM approval
Control drawing116-0118
UL approval
Control drawing116-0139 (cULus)
IECEx approval
IECEx certificateIECEx BAS 09.0142
IECEx BAS 17.0091X
IECEx marking[Ex ia Ga] IIC , [Ex ia Da] IIIC , [Ex ia Ma] I
Ex ec IIC T4 Gc
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see


ECLASS 11.027211016
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: Z728

ManualsLanguageFile TypeFile Size
Manual Zener Barriers Z-SystemENGPDF1203 KB
Handbuch Zenerbarrieren Z-SystemGERPDF1203 KB
Instruction manuals
ИнструкцииBULPDF214 KB
Návod k poużitíCZEPDF209 KB
Instruktions manualDANPDF208 KB
Instruction manualENGPDF214 KB
KasutusjuhendESTPDF204 KB
KäyttöohjeFINPDF204 KB
Manuel d'instructionsFRAPDF211 KB
BetriebsanleitungGERPDF214 KB
Οδηγίες χρήσηςGREPDF217 KB
HandleidingHOLPDF209 KB
Instruction manual / BetriebsanleitungHRVPDF208 KB
Használati útmutatóHUNPDF210 KB
Manuale di istruzioniITAPDF209 KB
Lietošanas pamācībaLAVPDF208 KB
Instrukciju vadovasLITPDF208 KB
Instrukcja obsługiPOLPDF211 KB
Manual de instruçõesPORPDF210 KB
Manual de utilizareRONPDF209 KB
ИнструкцииRUSPDF216 KB
Návod na poużitieSLKPDF209 KB
Navodila za uporaboSLVPDF206 KB
Manual de instruccionesSPAPDF210 KB
ManualSWEPDF205 KB

Approvals+Certificates: Z728

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0060DPDF102 KB
UK Declaration of Conformity / UK-KonformitätserklärungDOC-5844PDF98 KB
Baseefa IECEx Certificate of ConformityIECEx BAS 17.0091XLINK---
Baseefa IECEx Certificate of ConformityIECEx BAS 09.0142LINK---
Brasil TUV Rheinland BrazilTÜV 14.0362PDF584 KB
China SITIIAS CCC Ex Certificate2020322316002775 (Bintan)PDF3587 KB
EAC Lenpromexpertiza (LPE) EAC TP TC 012/2011EAEC RU C-DE.AA71.B.00100/19PDF6852 KB
Europe Baseefa Group I (M1) ATEX Category (1) GDBAS 01 ATEX 7005PDF8525 KB
Europe TUV Nord II 3 G ATEX Category 3 GTÜV 99 ATEX 1484XPDF1460 KB
India PESO (India) CCOEA/P/HQ/MH/104/5723 (P454334)PDF314 KB
Japan TIISTC 15958PDF3165 KB
Korea KOSHA09-AV4BO-0228/0229/0230PDF717 KB
Korea KOSHA14-AV4BO-0610PDF285 KB
SIMTARS IECEx Certificate of ConformityIECEx SIM 06.0012XLINK---
South Africa MASCMASC MS/17-0887PDF921 KB
USA Canada UL Hazardous Location Certificate of Compliance cULus UL E106378CoC 20190321 - E106378 RepRef 19960425PDF252 KB
USA FMFM 17 US 0370PDF416 KB
United Kingdom CML UK-Type Examination Certificate UKEX Category (1) D UKEX Category (1) G UKEX Category (M1)CML 21UKEX2898PDF818 KB
Worldwide Pepperl+Fuchs Functional Safety AssessmentCERT-5207PDF575 KB
Control drawings
Control drawing FM / Control drawing FM   PDF167 KB
Control drawing UL / Control drawing UL   PDF170 KB

Function: Z728

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.