Serviceline Industrial Sensors
Serviceline Explosion Protection

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This product has been replaced.Go to replacement product KFD2-STC4-Ex1
Not available for purchase
Not available for purchase

SMART Transmitter Power Supply KFD2-STC4-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
  • 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-STC4-Ex1

Product Description
Input 0/4 mA ... 20 mA
Output 0/4 mA ... 20 mA
General specifications
Signal typeAnalog input
ConnectionPower Rail or terminals 14+, 15-
Rated voltage20 ... 35 V DC
Ripplewithin the supply tolerance
Power dissipation1.5 W
Power consumption1.9 W
Connectionterminals 1+, 2-, 3 or 5-, 6+
Input signal0/4 ... 20 mA
Voltage drop≤ 2.4 V at 20 mA (terminals 5, 6)
Input resistance≤ 64 Ω terminals 2-, 3 ; ≤ 500 Ω terminals 1+, 3 (250 Ω load)
Available voltage≥ 16 V at 20 mA terminals 1+, 3
Connectionterminals 7-, 8+, 9
Load0 ... 800 Ω
Output signal0/4 ... 20 mA (overload > 25 mA)
Ripplemax. 50 µA rms
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 temperature0.25 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 time20 µs
Galvanic isolation
Output/power supplyfunctional insulation, rated insulation voltage 50 V AC
Directive conformity
Electromagnetic compatibility
Directive 2004/108/ECEN 61326-1:2006
Electromagnetic compatibilityNE 21:2006
Degree of protectionIEC 60529:2001
Protection against electrical shockUL 61010-1:2012
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protectionIP20
Massapprox. 200 g
Dimensions20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) , housing type B2
Height124 mm
Width20 mm
Length115 mm
Mountingon 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
EU-type examination certificateBAS 99 ATEX 7060 , for additional certificates see
MarkingEx-Hexagon II (1)G [Ex ia Ga] IIC , Ex-Hexagon II (1)D [Ex ia Da] IIIC
Input[Ex ia Ga] IIC, [Ex ia Da] IIIC
Maximum safe voltage250 V (Attention! The rated voltage can be lower.)
Equipmentterminals 1+, 3-
Voltage25.4 V
Current86.8 mA
Power551 mW
Internal capacitance12 nF
Internal inductance0 mH
Equipmentterminals 2-, 3
Current74 mA / 115 mA
Current115 mA
Voltage3.5 V
Current74 mA
Power64 mW
Equipmentterminals 1+, 2 / 3-
Voltage30 V
Current115 mA
Voltage25.4 V
Current115 mA
Power584 mW
Equipmentterminals 5-, 6+
Voltage30 V
Current115 mA
Voltage8.7 V
Current0 mA
Maximum safe voltage250 V (Attention! The rated voltage can be lower.)
EU-type examination certificateDMT 01 ATEX E 133
MarkingEx-Hexagon I (M1) [Ex ia] I
CertificateTÜV 99 ATEX 1499 X , observe statement of conformity
MarkingEx-Hexagon II 3G Ex nA II T4 [device in zone 2]
Galvanic isolation
Input/Outputsafe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Input/power supplysafe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Directive conformity
Directive 94/9/ECEN 60079-0:2012 , EN 60079-11:2012 , EN 60079-15:2010 , EN 50303:2000
International approvals
UL approval
Control drawing116-0173 (cULus)
IECEx approvalIECEx BAS 04.0016
Approved for[Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
General information
Supplementary informationEC-Type Examination Certificate, Statement of Conformity, Declaration of Conformity, Attestation of Conformity and instructions have to be observed where applicable. For information see


ECLASS 13.027210119
ECLASS 12.027210119
ECLASS 11.027210119
ECLASS 10.0.127210119
ECLASS 9.027210119
ECLASS 8.027210119
ECLASS 5.127210119
ETIM 9.0EC001485
ETIM 8.0EC001485
ETIM 7.0EC001485
ETIM 6.0EC001485
ETIM 5.0EC001485
UNSPSC 12.132101514

Details: KFD2-STC4-Ex1

Product Documentation: KFD2-STC4-Ex1

Language Selection:
Safety and Security DocumentationLanguageFile TypeFile Size
Instruction manualENGPDF50 KB
ManualENGPDF557 KB
ManualENGPDF3685 KB

Design / Simulation: KFD2-STC4-Ex1

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

Approvals: KFD2-STC4-Ex1

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CertificatesCertificate No.LanguageFile TypeFile Size
Australia SIMTARS Group IANZEx 13.2004XALLPDF353 KB
Baseefa IECEx Certificate of ConformityIECEx BAS 04.0016XALLLINK---
Canada UL cULE106378 cUL (QUZW7)ALLLINK---
Europe Baseefa ATEX Category (1) D ATEX Category (1) GD ATEX Category (1) GBAS 99 ATEX 7060XALLPDF3914 KB
Europe DEKRA EXAM ATEX Category (M1)DMT 01 ATEX E 133ALLPDF1310 KB
Europe TUV Nord ATEX Category 3 GTÜV 99 ATEX 1499XALLPDF1999 KB
exida Functional Safety Assessment SummaryP+F 05/09-21 R024ALLPDF349 KB
Control Drawings
Control drawing UL / Control drawing UL   ALLPDF1092 KB
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