Serviceline Industrial Sensors
Serviceline Explosion Protection

Switch Amplifier KFD2-SOT2-Ex2.IO-Y181008

  • 2-channel isolated barrier
  • 24 V DC supply (Power Rail)
  • Dry contact or NAMUR inputs
  • Isolated passive transistor output, TTL level
  • Line fault detection (LFD)
  • Reversible mode of operation

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-SOT2-Ex2.IO-Y181008

General specifications
Signal typeDigital Input
ConnectionPower Rail or terminals 14+, 15-
Rated voltage20 ... 30 V DC
Ripple≤ 10 %
Rated current≤ 50 mA
Connection sidefield side
Connectionterminals 1+, 2+, 3-; 4+, 5+, 6-
Rated valuesacc. to EN 60947-5-6 (NAMUR), see manual for electrical data
Open circuit voltage/short-circuit currentapprox. 8 V DC / approx. 8 mA
Switching point/switching hysteresis1.2 ... 2.1 mA / approx. 0.2 mA
Line fault detectionbreakage I ≤ 0.1 mA , short-circuit I > 6 mA
Connection sidecontrol side
Connectionoutput I: terminals 7+, 8- ; output II: terminals 10+, 11-
Switching voltagemax. 30 V
Switching currentmax. 2 mA , short-circuit protected
Signal level1-signal: switching voltage - 0.85 V max. at 2 mA switching current
0-signal: switched off (off-state current ≤ 10 µA)
Output I, IIsignal , TTL compatible
Collective error messagePower Rail
Transfer characteristics
Switching frequency≤ 5 kHz
Galvanic isolation
Input/Outputreinforced insulation acc. to IEC 62103, rated insulation voltage 300 Vrms
Input/power supplyreinforced insulation acc. to IEC 62103, rated insulation voltage 300 Vrms
Output/power supplybasic insulation according to IEC 62103, rated insulation voltage 50 Veff
Output/Outputbasic insulation according to IEC 62103, rated insulation voltage 50 Veff
Display elementsLEDs
Control elementsDIP switch
Configurationvia DIP switches
Labelingspace for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EUEN 61326-1:2013 (industrial locations)
Galvanic isolationIEC 62103:2003
Electromagnetic compatibilityNE 21:2004
Degree of protectionIEC 60529:2001
InputEN 60947-5-6:2000
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals
Massapprox. 150 g
Dimensions20 x 119 x 115 mm (0.8 x 4.7 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 00 ATEX 2035
MarkingEx-Hexagon II (1) G [Ex ia] IIC
Ex-Hexagon II (1) D [Ex ia] IIIC
InputEx ia IIC, Ex ia IIIC
Voltage10.5 V
Current13 mA
Power34 mW (linear characteristic)
Maximum safe voltage40 V DC (Attention! The rated voltage can be lower.)
Maximum safe voltage40 V DC (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
MarkingEx-Hexagon II 3G Ex nA II T4
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 2014/34/EUEN 60079-0:2012+A11:2013 , EN 60079-11:2012 , EN 60079-15:2010 , EN 50303:2000
International approvals
FM approval
Control drawing116-0035
CSA approval
Control drawing116-0047
IECEx approval
IECEx certificateIECEx PTB 05.0011
IECEx marking[Ex ia] IIC , [Ex ia] I , [Ex ia] IIIC
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see


ECLASS 11.027210121
ECLASS 10.0.127210121
ECLASS 9.027210121
ECLASS 8.027210121
ECLASS 5.127210121
ETIM 8.0EC001485
ETIM 7.0EC001485
ETIM 6.0EC001485
ETIM 5.0EC001485
UNSPSC 12.132101514

Details: KFD2-SOT2-Ex2.IO-Y181008


This isolated barrier is used for intrinsic safety applications. It transfers digital signals (NAMUR sensors/mechanical contacts) from a hazardous area to a safe area.

Each proximity sensor or switch controls a passive transistor output for the safe area load. Both transistor outputs are isolated from each other and isolated from the power supply. The normal output state can be reversed using switch S1 for channel I and switch S2 for channel II. Switch S3 enables or disables line fault detection of the field circuit.

During an error condition, the transistors revert to their de-energized state and LEDs indicate the fault according to NAMUR NE44.

A unique collective error messaging feature is available when used with the Power Rail system.

Product Documentation: KFD2-SOT2-Ex2.IO-Y181008

Language Selection:
Safety and Security DocumentationLanguageFile TypeFile Size
Instruction manualENGPDF50 KB
System Manual ENGPDF3673 KB

Design / Simulation: KFD2-SOT2-Ex2.IO-Y181008

Language Selection:
CADLanguageFile TypeFile Size
3-D model / 3-D-ModellALLSTP2510 KB
CAD Portal / CAD PortalALLLINK---

Approvals: KFD2-SOT2-Ex2.IO-Y181008

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
Australia SIMTARS Group IANZEx 12.2011ALLPDF310 KB
Brasil TUV Rheinland BrazilTÜV 14.0367ALLPDF1203 KB
Canada CSACoC 1029981 CALLPDF177 KB
Europe DEKRA EXAM ATEX Category (M1)DMT 01 ATEX E 133ALLPDF1310 KB
Europe PTB ATEX Category (1) GDPTB 00 ATEX 2035ALLPDF947 KB
Europe TUV Nord ATEX Category 3 GTÜV 99 ATEX 1499XALLPDF1999 KB
Korea KOSHA14-AV4BO-0163ALLPDF270 KB
PTB Group II Group I IECEx Certificate of ConformityIECEx PTB 05.0011ALLLINK---
South Africa MASCMASC M/17-0784ALLPDF253 KB
Ukraine SERTIS ExSC 21.0646 XALLPDF12351 KB
exida Functional Safety AssessmentP+F 01/09-02D R002ALLPDF154 KB
Control Drawings
Control Drawing FM / Control Drawing FM   ALLPDF130 KB
Control Drawing CSA / Control Drawing CSA   ALLPDF159 KB
Declaration of Conformity
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0030CALLPDF59 KB

Associated Products: KFD2-SOT2-Ex2.IO-Y181008

1-channel, Dry contact input, For line fault detection (LFD)pa
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, 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
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