Serviceline Industrial Sensors
Serviceline Explosion Protection

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 I/P or transmitter power supply
  • Low voltage drop
  • Line fault detection (LFD)
  • Up to SIL 2 acc. to IEC/EN 61508

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 voltageloop 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
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 11.027210120
ECLASS 10.0.127210120
ECLASS 9.027210120
ECLASS 8.027210120
ECLASS 5.127210120
ETIM 8.0EC002653
ETIM 7.0EC002653
ETIM 6.0EC002653
ETIM 5.0EC001485
UNSPSC 12.132101514

Documents: KFD0-SCS-Ex1.55

ManualsLanguageFile TypeFile Size
System Manual ENGPDF3524 KB
SystemhandbuchGERPDF3557 KB
Instruction manuals
ИнструкцииBULPDF135 KB
Návod k poużitíCZEPDF131 KB
Instruktions manualDANPDF129 KB
Instruction manualENGPDF135 KB
KasutusjuhendESTPDF126 KB
KäyttöohjeFINPDF125 KB
Manuel d'instructionsFRAPDF130 KB
BetriebsanleitungGERPDF135 KB
Οδηγίες χρήσηςGREPDF138 KB
HandleidingHOLPDF129 KB
Instruction manual / BetriebsanleitungHRVPDF129 KB
Használati útmutatóHUNPDF131 KB
Manuale di istruzioniITAPDF129 KB
Lietošanas pamācībaLAVPDF129 KB
Instrukciju vadovasLITPDF130 KB
Instrukcja obsługiPOLPDF131 KB
Manual de instruçõesPORPDF130 KB
Manual de utilizareRONPDF130 KB
Návod na poużitieSLKPDF130 KB
Navodila za uporaboSLVPDF128 KB
Manual de instruccionesSPAPDF130 KB
ManualSWEPDF127 KB

Approvals+Certificates: KFD0-SCS-Ex1.55

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0025EPDF82 KB
Belarus Pattern ApprovalNr. 11709PDF15640 KB
EAC Pepperl+Fuchs EAC TP TC 020/2011EAEC N RU D-DE.PA01.B.95500/21PDF748 KB
Europe PTB ATEX Category (2) GPTB 02 ATEX 2064PDF6215 KB
Europe Pepperl+Fuchs Certificate of Compliance ATEX Category 3PF 11 CERT 0902 XPDF179 KB
Russia Belarus Kazakhstan EAC EAC TP TC 012/2011EAEC RU C-DE.EX01.B.00102/19PDF9815 KB
Russia VNIIMS Pattern ApprovalOC.C.34.004.A No.56757PDF6680 KB
South Africa MASCMASC MS/17-0867PDF3971 KB
exida Functional Safety AssessmentP+F 03/07-04-R013PDF284 KB

Associated Products: KFD0-SCS-Ex1.55

3-pin screw terminal, For KF modules of K-System, Packaging unit: 5 pieces greenpa
3-pin screw terminal, For KF modules of K-System, Integrated test sockets for connection of HART communicators, Packaging unit: 5 pieces greenpa
3-pin screw terminal, For KF modules of K-System, Integrated test sockets for connection of HART communicators, Packaging unit: 5 pieces bluepa
Coding of K-System terminal blocks, Coding of LB/FB-System front sockets, Packaging unit: 20 x 6 coding pinspa

Function: 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.