Serviceline Industrial Sensors
Serviceline Explosion Protection

Repeater KFD0-CS-Ex2.54

  • 2-channel isolated barrier
  • 24 V DC supply (loop powered)
  • SMART fire alarm input
  • Current input 1 mA ... 20 mA
  • Up to SIL 3 acc. to IEC 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-CS-Ex2.54

General specifications
Signal typeAnalog input
Functional safety related parameters
Safety Integrity Level (SIL)SIL 3
Rated voltageloop powered
Power dissipation< 0.2 W for Uin = 24 V, Io = 20 mA
Control circuit
Connectionterminals 11+, 12-; 9+, 10-, 8-
Voltage0 ... 24 V for 4 V ≤ Ue ≤ 24 V: ≥ Ue - (0.41 x input current in mA) - 0.5
Current0 ... 20 mA
Field circuit
Connectionterminals 1+, 2-; 4+, 5-
Short-circuit current≤ 65 mA
Transmission rangecurrent: 1 ... 20 mA
voltage: 4 ... 20 V DC / 0 ... 6 Vss AC
Transfer characteristics
After calibration≤ 3.5 mA current loss at 20 mA load current
Influence of ambient temperature± 20 µA / K
Rise time/fall time≤ 50 µs (load current ≥ 1 mA)
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 21:2006
Degree of protectionIEC 60529:2001
Protection against electrical shockUL 61010-1
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °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) , housing type B1
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 7087
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
Power653 mW
Maximum safe voltage253 V (Attention! The rated voltage can be lower.)
CertificateTÜV 99 ATEX 1499 X
MarkingEx-Hexagon II 3G Ex nA II T4 Gc [device in zone 2]
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 approval
Control drawing116-0129 (cFMus)
UL approval
Control drawing116-0348 (cULus)
IECEx approval
IECEx certificateIECEx BAS 08.0079
IECEx BAS 10.0007X
IECEx marking[Ex ia Ga] IIC , [Ex ia Da] IIIC , [Ex ia Ma] I
Ex nA II T4 Gc
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see

Documents: KFD0-CS-Ex2.54

ManualsLanguageFile TypeFile Size
Functional Safety ManualENGPDF462 KB
Manual Isolated Barriers K-systemENGPDF760 KB
Manuel pour Barrières Isolées de Système KFRAPDF759 KB
Handbuch Funktionale SicherheitGERPDF465 KB
Handbuch Trennbarrieren K-SystemGERPDF745 KB
Manual Isolated Barriers K-systemRUSPDF4107 KB
Instruction manuals
ИнструкцииBULPDF69 KB
Návod k poużitíCZEPDF61 KB
Instruktions manualDANPDF58 KB
Instruction manualENGPDF50 KB
KasutusjuhendESTPDF56 KB
KäyttöohjeFINPDF56 KB
Manuel d'instructionsFRAPDF97 KB
BetriebsanleitungGERPDF62 KB
Οδηγίες χρήσηςGREPDF73 KB
HandleidingHOLPDF72 KB
Instruction manual / BetriebsanleitungHRVPDF70 KB
Használati útmutatóHUNPDF71 KB
Manuale di istruzioniITAPDF93 KB
Lietošanas pamācībaLAVPDF68 KB
Instrukciju vadovasLITPDF68 KB
Instrukcja obsługiPOLPDF72 KB
Manual de instruçõesPORPDF72 KB
Manual de utilizareRONPDF71 KB
Návod na poużitieSLKPDF130 KB
Manual de instruccionesSPAPDF95 KB

Approvals+Certificates: KFD0-CS-Ex2.54

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0035CPDF65 KB
Baseefa IECEx Certificate of ConformityIECEx BAS 08.0079LINK---
Baseefa Type n IECEx Certificate of ConformityIECEx BAS 10.0007XLINK---
Brasil TUV RheinlandTÜV 15.0794PDF1291 KB
Canada FMCoC 3036564cPDF322 KB
Canada UL cULE106378 cUL (QVAJ7)LINK---
Canada UL cULE106378 cUL (QUZW7)LINK---
EAC EAC TP TC 020/2011TC RU C-DE.MH04.B.00397PDF680 KB
Europe Baseefa ATEX Category (1) GDBAS 00 ATEX 7087PDF801 KB
Europe TUV Nord ATEX Category 3 GTÜV 99 ATEX 1499XPDF1999 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
Worldwide Pepperl+Fuchs Functional Safety AssessmentFS-0082PF-20APDF432 KB
Control drawings
Control Drawing FM / Control Drawing FM   PDF58 KB
Control Drawing UL / Control Drawing UL   PDF56 KB

Function: KFD0-CS-Ex2.54

This isolated barrier is used for intrinsic safety applications. It provides control and signal transfer for SMART compatible fire and smoke alarm transmitters inside hazardous areas.

Digital signals may be superimposed on the analog values in the hazardous or safe area and are transferred bidirectionally.

The fall time of the digital signal must be less than 50 μs, the current in the hazardous area must be bigger than 1 mA.

Since this isolator is loop-powered, use the technical data to verify that proper voltage is available to the field devices.