Serviceline Industrial Sensors
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Fax: 330-405-4710
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Fax: 330-963-5827

SMART Current Driver/Repeater KFD0-SCS-Ex1.55

  • 1-channel isolated barrier
  • 24 V DC supply (loop powered)
  • Current input/output 4 mA ... 20 mA
  • HART-IP or transmitter power supply
  • Low voltage drop
  • Line fault detection (LFD)
  • Up to SIL 2 acc. to IEC/EN 61508
 Please contact the Serviceline for exact delivery estimation
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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-SCS-Ex1.55

General specifications
Signal typeAnalog input/analog output
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
Rated voltage< 30 V DC , loop powered
Power dissipation0.2 W
Control circuit
Connectionterminals 8-, 9+
Voltagemax. 30 V DC
Current4 ... 20 mA (quiescent current < 0.5 mA)
Power dissipation150 mW at 20 mA and Uin < 24 V
Field circuit
Connectionterminals 1+, 2 / 3-
Voltage≥ 16 V for supply voltage > 21 V
Current4 ... 20 mA (linear transmission 1 ... 22 mA)
Load≤ 800 Ω (at 20 mA)
Transfer characteristics
Voltage dropsee note
After calibration≤ ± 80 µA linearity, load and voltage dependence at 20 °C (68 °F)
Influence of ambient temperature< 0.5 µA/K
Dampingapprox. 3 dB
Rise time≤ 20 µs at 0 Ω, ≤ 600 µs with 800 Ω load
Galvanic isolation
Input/Outputsafe 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 21:2007
Degree of protectionIEC 60529:2001
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals
Massapprox. 120 g
Dimensions20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) (W x H x D) , housing type B2
Height112 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 certificatePTB 02 ATEX 2064
MarkingEx-Hexagon II (2)G [EEx ib] IIC
Voltage23.1 V DC
Current28 mA
Power0.647 W
Maximum safe voltage253 V (Attention! The rated voltage can be lower.)
CertificatePF 11 CERT 0902 X
MarkingEx-Hexagon II 3G Ex nA IIC T4 Gc
Galvanic isolation
Input/Outputsafe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Directive conformity
Directive 2014/34/EUEN 60079-0:2012+A11:2013 , EN 60079-11:2012 , EN 60079-15:2010
International approvals
FM approvaldevice with FM approval on request
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-SCS-Ex1.55


This isolated barrier is used for intrinsic safety applications. It is loop powered and isolates a 4 mA ... 20mA signal for transmitters and positioners and is HART compatible.

With a noticeably lower power loss compared to active isolator modules, the barriers 5 V drop makes it suitable for transmitter applications with unstable power sources between 20 V DC ... 30 V DC.

Line fault detection of the field circuit is possible if the control loop in the safe area is monitored for overscale or underscale conditions of the 4 mA ... 20mA range.

The module can also be used for controlling solenoid valves and discrete outputs, such as LEDs. In this case, terminals 8- and 9+ are driven with a 24 V signal.

Informative Literature: KFD0-SCS-Ex1.55

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-SCS-Ex1.55

Language Selection:
Safety and Security DocumentationLanguageFile TypeFile Size
Instruction manualENGPDF135 KB
ManualENGPDF3685 KB

Design / Simulation: KFD0-SCS-Ex1.55

Language Selection:
CADLanguageFile TypeFile Size
CAD Portal / CAD PortalALLLINK---
CAE EPLAN Data Portal / CAE EPLAN Data PortalALLLINK---

Approvals: KFD0-SCS-Ex1.55

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
Europe PTB ATEX Category (2) GPTB 02 ATEX 2064ALLPDF6215 KB
Europe Pepperl+Fuchs Certificate of Compliance ATEX Category 3PF 11 CERT 0902 XALLPDF179 KB
South Africa MASCMASC S/17-0867ALLPDF209 KB
exida Functional Safety AssessmentP+F 03/07-04-R013ALLPDF284 KB
Declaration of Conformity
EU Declaration of Conformity (P+F) / EU-Konformitäterklärung (P+F)DOC-0025EALLPDF82 KB

Associated Products: KFD0-SCS-Ex1.55

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