Serviceline Industrial Sensors
Serviceline Explosion Protection

SMART Transmitter Power Supply KFD2-STC5-Ex1

  • 1-channel isolated barrier
  • 24 V DC supply (Power Rail)
  • Input 2-wire and 3-wire SMART transmitters and 2-wire SMART current sources
  • Output 0/4 mA ... 20 mA current sink/current source
  • Terminals with test points
  • Up to SIL 2 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  KFD2-STC5-Ex1

General specifications
Signal typeAnalog input
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
ConnectionPower Rail or terminals 14+, 15-
Rated voltage18 ... 30 V DC
Ripplewithin the supply tolerance
Power dissipation≤ 1 W at maximum load
Power consumption≤ 1.6 W at maximum load
Connection sidefield side
Connectionterminals 1+, 2-, 3
Input signal0/4 ... 20 mA
Open circuit voltage/short-circuit currentterminals 1+, 3: 23 V / 25 mA
Input resistancemax. 265 Ω terminals 2-, 3 , max. 330 Ω terminals 1+, 3
Available voltage≥ 16 V at 20 mA ; ≥ 20 V at 4 mA , terminals 1+, 3
Connection sidecontrol side
Connectionterminals 7+, 8-, 9- (sink)
terminals 7-, 8+, 9+ (source)
see additional information
Load0 ... 800 Ω
Output signal0/4 ... 20 mA (overload > 25 mA)
Ripplemax. 50 µA rms
External supply (loop)2 ... 30 V DC
Transfer characteristics
Deviationat 20 °C (68 °F), 0/4 ... 20 mA
≤ 10 µA incl. calibration, linearity, hysteresis, loads and fluctuations of supply voltage
Influence of ambient temperature≤ 0.25 µA/K
Frequency rangefield side into the control side: bandwidth with 0.5 Vpp signal 0 ... 7.5 kHz (-3 dB)
control side into the field side: bandwidth with 0.5 Vpp signal 0.3 ... 7.5 kHz (-3 dB)
Settling time200 µs
Rise time/fall time100 µs
Galvanic isolation
Output/power supplyfunctional insulation, rated insulation voltage 50 V AC
Display elementsLED
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. 150 g
Dimensions20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) , 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 certificateCML 17 ATEX 2029X
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
Input[Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
Maximum safe voltage250 V (Attention! The rated voltage can be lower.)
Equipmentterminals 1+, 3-
Voltage Uo26.2 V
Voltage Uq27.25 V
Current Io93 mA
Power Po634 mW
Equipmentterminals 2-, 3
Voltage Ui30 V
Current Ii115 mA
Power Pimax 1 W
Voltage Uo2 V
Current Io8.5 mA
Power Po4.3 mW
Equipmentterminals 1+, 2 / 3-
Voltage Uo26.2 V
Voltage Uq27.25 V
Current Io115 mA
Power Po784 mW
CertificateCML 17 ATEX 3028X
MarkingEx-Hexagon II 3G Ex ec IIC T4 Gc
Galvanic isolation
Input/Outputsafe electrical isolation acc. to IEC/EN 60079-11:2007, voltage peak value 375 V
Input/power supplysafe electrical isolation acc. to IEC/EN 60079-11:2007, voltage peak value 375 V
Directive conformity
Directive 2014/34/EUEN IEC 60079-0:2018 , EN 60079-7:2015+A1:2018 , EN 60079-11:2012
International approvals
UL approvalE106378
Control drawing116-0439 (cULus)
IECEx approval
IECEx certificateIECEx CML 17.0015X
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 11.027210119
ECLASS 10.0.127210119
ECLASS 9.027210119
ECLASS 8.027210119
ECLASS 5.127210119
ETIM 8.0EC001485
ETIM 7.0EC001485
ETIM 6.0EC001485
ETIM 5.0EC001485
UNSPSC 12.132101514

Documents: KFD2-STC5-Ex1

ManualsLanguageFile TypeFile Size
Functional Safety ManualENGPDF2023 KB
System Manual ENGPDF3524 KB
Handbuch Funktionale SicherheitGERPDF2037 KB
SystemhandbuchGERPDF3557 KB
Instruction manuals
Návod k poużitíCZEPDF145 KB
Instruktions manualDANPDF143 KB
Instruction manualENGPDF149 KB
KasutusjuhendESTPDF140 KB
KäyttöohjeFINPDF139 KB
Manuel d'instructionsFRAPDF145 KB
BetriebsanleitungGERPDF149 KB
Οδηγίες χρήσηςGREPDF153 KB
HandleidingHOLPDF143 KB
Instruction manual / BetriebsanleitungHRVPDF142 KB
Használati útmutatóHUNPDF144 KB
Manuale di istruzioniITAPDF143 KB
Lietošanas pamācībaLAVPDF143 KB
Instrukciju vadovasLITPDF144 KB
Instrukcja obsługiPOLPDF146 KB
Manual de instruçõesPORPDF144 KB
Manual de utilizareRONPDF144 KB
Návod na poużitieSLKPDF144 KB
Navodila za uporaboSLVPDF142 KB
Manual de instruccionesSPAPDF144 KB
ManualSWEPDF141 KB


CADFile TypeFile Size
3-D model / 3-D-ModellSTP3048 KB
EPLAN macro P+F.KFD2-STC5-Ex1 / EPLAN-Makro P+F.KFD2-STC5-Ex1EDZ73 KB

Approvals+Certificates: KFD2-STC5-Ex1

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-3529APDF129 KB
Belarus Pattern ApprovalNr. 11709PDF15640 KB
Brasil TUV Rheinland BrazilTÜV 19.0463XPDF1453 KB
Canada UL cULE106378 cUL (QUZW7)LINK---
Canada UL cULE106378 cUL (QVAJ7)LINK---
China NEPSIGYJ 19.1283XPDF2757 KB
China SITIIAS CCC Ex Certificate2020322316001403 (Singapore)PDF1822 KB
EAC EAC TP TC 012/2011TC RU C-DE.AA71.B.00291PDF2516 KB
EAC Pepperl+Fuchs EAC TP TC 020/2011EAEC N RU D-DE.PA01.B.95500/21PDF748 KB
Europe CML ATEX Category 3 GCML 17ATEX3028XPDF125 KB
Europe CML I (M1) II (1) D ATEX II (1) GCML 17ATEX2029XPDF237 KB
IECEx Certificate of ConformityIECEx CML 17.0015XLINK---
India PESO (India) CCOEA/P/HQ/KA/104/5584 (P423274)PDF1111 KB
Korea KOSHA18-AV4BO-0355XPDF567 KB
Russia VNIIMSDE.C.34.004.A No.64324/1PDF10397 KB
Worldwide TUV Rheinland968/FSP 1498.00/17 ENPDF679 KB
Control drawings
/116/1160439a.pdf   PDF37 KB

Associated Products: KFD2-STC5-Ex1

Matching System Components

35 mm DIN mounting rail with 3-conductor insert, Provides DC supply voltage to all equipped K-System modules, Standard length 2 m (6 foot), simple to customize to application space, Eliminates daisy-chainspa

35 mm DIN mounting rail with 3-conductor insert, Provides DC supply voltage to all equipped K-System modules, Standard length 0.8 m (2.6 ft), simple to customize to application space, Eliminates daisy-chainspa
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1-channel, Precision resistor, Conversion of 0 mA ... 20 mA/0 V ... 5 V, Packaging unit: 5 piecespa
1-channel, Precision resistor, Conversion of 4 mA ... 20 mA/2 V ... 10 V, Packaging unit: 5 piecespa
Coding of K-System terminal blocks, Coding of LB/FB-System front sockets, Packaging unit: 20 x 6 coding pinspa

Function: KFD2-STC5-Ex1

This isolated barrier is used for intrinsic safety applications.

The device supplies 2-wire and 3-wire SMART transmitters, and can also be used with 2-wire SMART current sources.

It transfers the analog input signal to the safe area as an isolated current value.

Digital signals may be superimposed on the input signal in the hazardous or non-hazardous area and are transferred bi-directionally.

The device provides a sink mode or a source mode output on the safe area terminals.

The device has an internal resistor. Use this resistor if the HART communication resistance in the control circuit is too low.

Test sockets for the connection of HART communicators are integrated into the terminals of the device.