Serviceline Industrial Sensors
Phone: 330-486-0001
Fax: 330-405-4710
Serviceline Explosion Protection
Phone: 330-486-0002
Fax: 330-963-5827

Current Driver/Repeater KFD0-CS-Ex2.51P

  • 2-channel isolated barrier
  • 24 V DC supply (loop powered)
  • Current input/output 0 mA ... 40 mA
  • I/P or transmitter power supply
  • Accuracy 1 %
  • Reverse polarity protection
  • Up to SIL 2 (SC 3) acc. to IEC/EN 61508
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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  KFD0-CS-Ex2.51P

General specifications
Signal typeAnalog input/analog output
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
Systematic capability (SC)SC 3
Rated voltage4 ... 35 V DC , loop powered
Control circuit
Connectionterminals 12-, 11+; 8-, 10-, 9+
Voltage4 ... 35 V DC
Current0 ... 40 mA
Power dissipationat 40 mA and Uin < 22 V: 700 mW per channel
at 40 mA and Uin > 22 V: 1.2 W per channel
Field circuit
Connectionterminals 1+, 2-; 4+, 5-
Voltagefor 4 V < Uin < 24 V: ≥ Uin - (0.37 x current in mA) - 1.0
for Uin > 24 V: ≥ 21 V - (0.36 x current in mA)
Short-circuit currentat Uin > 24 V: ≤ 65 mA
Transfer current≤ 40 mA
Transfer characteristics
Accuracy1 %
After calibration≤ ± 200 µA; incl. calibration, linearity, hysteresis and load fluctuations at the field side up to a load of 1 kΩ and current ≤ 20 mA at 20 °C (68 °F)
Influence of ambient temperature≤ ± 2 µA/K at Uin ≤ 20 V; ≤ ± 5 µA/K at Uin > 20 V
Rise time≤ 5 ms at bounce from 4 ... 20 mA and Uin < 24 V
Galvanic isolation
Field circuit/control circuitsafe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Labelingspace for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EUEN 61326-1:2013 (industrial locations)
Electromagnetic compatibilityNE 21:2012
EN 61326-3-2:2008
Degree of protectionIEC 60529:2001
Protection against electrical shockUL 61010-1:2012
Ambient conditions
Ambient temperature-20 ... 70 °C (-4 ... 158 °F)
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals
Massapprox. 100 g
Dimensions20 x 107 x 115 mm (0.8 x 4.2 x 4.5 inch) (W x H x D) , housing type B1
Height107 mm
Width20 mm
Depth115 mm
Mountingon 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
EU-type examination certificateBAS 98 ATEX 7343 X
MarkingEx-Hexagon II (1)G [Ex ia Ga] IIC
Ex-Hexagon II (1)D [Ex ia Da] IIIC
Ex-Hexagon I (M1) [Ex ia Ma] I
Voltage25.2 V
Current93 mA
Power585 mW
Control circuit
Maximum safe voltage250 V eff (Attention! The rated voltage can be lower.)
Field circuit
Maximum safe voltage250 V eff (Attention! The rated voltage can be lower.)
CertificateFIDI 22 ATEX 0001 X
MarkingEx-Hexagon II 3G Ex ec IIC T4 Gc
Galvanic isolation
Field circuit/control circuitsafe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Directive conformity
Directive 2014/34/EUEN IEC 60079-0:2018 , EN 60079-11:2012 , EN IEC 60079-7:2015+A1:2018
International approvals
FM approval
Control drawing116-0437
UL approvalE106378
Control drawing116-0438 (cULus)
IECEx approval
IECEx certificateIECEx BAS 05.0004X
IECEx CML 19.0040X
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 13.027210120
ECLASS 12.027210120
ECLASS 11.027210120
ECLASS 10.0.127210120
ECLASS 9.027210120
ECLASS 8.027210120
ECLASS 5.127210120
ETIM 9.0EC002653
ETIM 8.0EC002653
ETIM 7.0EC002653
ETIM 6.0EC002653
ETIM 5.0EC001485
UNSPSC 12.132101514

Details: KFD0-CS-Ex2.51P


This isolated barrier is used for intrinsic safety applications.

The device transfers DC signals of fire alarms and smoke alarms from the hazardous area to the non-hazardous area. The device can also be used to control I/P converters, valves, indicators, and audible alarms.

A reverse polarity protection prevents damage to the device caused by faulty wiring.

The device is loop powered. From the control side no additional power supply has to be connected.

Use the technical data to verify that proper voltage is available to the field devices.

Informative Literature: KFD0-CS-Ex2.51P

Language Selection:
LiteratureLanguageFile TypeFile Size
Application Report - Energy Generation in Wastwater Treatment PlantsENGPDF532 KB
Application Report - Generating Electricity in Coal-Fired Power PlantsENGPDF412 KB
Application Report - Screening Systems in Sewage Treatment PlantsENGPDF577 KB
Application Report - Sicherer Brennstofftransport in KohlekraftwerkenENGPDF391 KB
Application Report - Water Inlet in Wastewater Treatment PlantsENGPDF526 KB

Product Documentation: KFD0-CS-Ex2.51P

Language Selection:
Safety and Security DocumentationLanguageFile TypeFile Size
Instruction manualENGPDF173 KB
Functional Safety ManualENGPDF1969 KB
ManualENGPDF3685 KB

Design / Simulation: KFD0-CS-Ex2.51P

Language Selection:
CADLanguageFile TypeFile Size
CAD Portal / CAD PortalALLLINK---

Approvals: KFD0-CS-Ex2.51P

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
Australia Test SafeANZEx 17.3006XALLPDF6788 KB
Baseefa IECEx Certificate of ConformityIECEx BAS 05.0004XALLLINK---
CML IECEx Certificate of ConformityIECEx CML 19.0040XALLLINK---
China SITIIAS CCC Ex Certificate2020322316001389 (Singapore)ALLPDF1009 KB
Europe Baseefa II (1) D II (1) G I (M1) ATEXBAS 98 ATEX 7343XALLPDF2755 KB
Europe Fiditas ATEX Category 3FIDI 22 ATEX 0001XALLPDF2254 KB
USA Canada UL Hazardous Location Certificate of Compliance cULus UL E106378CoC E106378 RepRef E106378-20180529ALLPDF354 KB
Ukraine SERTIS ExSC 21.0646 XALLPDF12351 KB
United Kingdom CML UK-Type Examination Certificate UKEX Category (1) D UKEX Category (1) G UKEX Category (M1)CML 21UKEX2709XALLPDF140 KB
Control Drawings
Control drawing FM / Control drawing FM   ALLPDF46 KB
Control drawing CSA / Control drawing CSA   ALLPDF501 KB
Declaration of Conformity
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-0772GALLPDF89 KB
UKCA-Declaration of conformity / UKCA-KonformitätserklärungDOC-5674ALLPDF79 KB

Associated Products: KFD0-CS-Ex2.51P

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