Serviceline Industrial Sensors
Serviceline Explosion Protection

Standstill and Rotational Direction Monitor KFD2-SR2-Ex2.W.SM

  • 2-channel isolated barrier
  • 24 V DC supply (Power Rail)
  • Dry contact or NAMUR inputs
  • Selectable frequency trip values
  • 2 relay contact outputs
  • Start-up override
  • Selectable mode of operation
  • 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  KFD2-SR2-Ex2.W.SM

General specifications
Signal typeDigital Input
Programmingvia DIP switch and programmable
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
ConnectionPower Rail or terminals 14+, 15-
Rated voltage20 ... 30 V DC
Power consumptionmax. 1.5 W
Connection sidefield side
ConnectionInput I: terminals 1+, 2+, 3- ;
Input II: terminals 4+, 5+, 6-
Rated valuesacc. to EN 60947-5-6 (NAMUR)
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
Control inputsensor power supply approx. 8.2 V, impedance 1.2 kΩ
Pulse duration> 200 µs for standstill monitoring,
> 250 µs for rotation direction detecion
Connection sidecontrol side
Connectionoutput I: terminals 7, 8, 9 ; output II: terminals 10, 11, 12
Contact loading250 V AC/2 A/cos φ > 0.75; 126.5 V AC/4 A/cos φ > 0.75; 40 V DC/2 A resistive load
Minimum switch current2 mA / 24 V DC
Energized/De-energized delayapprox. 20 ms / approx. 20 ms
Mechanical life107 switching cycles
Trip valuefor standstill monitoring:
0.1 Hz; 0.5 Hz; 2 Hz; 10 Hz
adjustable via DIP switch (S1 and S2)
Transfer characteristics
Accuracy5 % (S3 = I), 30 % (S3 = II)
Start-up override5 seconds or 20 seconds, programmable
Frequency range≤ 2 kHz
Rotation direction detection90° phase difference between pulse input signal 1 and 2, overlapping ≥ 125 µs
Galvanic isolation
Input/Outputreinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Input/power supplyreinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output/power supplyreinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output/Outputreinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 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)
Low voltage
Directive 2014/35/EUEN 61010-1:2010
Electromagnetic compatibilityNE 21:2006
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 2080
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
InputEx ia
Voltage10.5 V
Current13 mA
Power34 mW (linear characteristic)
Maximum safe voltage253 V AC / 125 V DC (Attention! Um is no rated voltage.)
Maximum safe voltage253 V AC (Attention! The rated voltage can be lower.)
Fault indication output
Maximum safe voltage40 V DC (Attention! Um is no rated voltage.)
CertificateTÜV 99 ATEX 1493 X
MarkingEx-Hexagon II 3G Ex ec nC IIC T4 Gc
Contact loading50 V AC/4 A/cos φ > 0.7; 40 V DC/2 A resistive load
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 IEC 60079-0:2018+AC:2020 , EN 60079-7:2015+A1:2018 , EN 60079-11:2012 , EN IEC 60079-15:2019
International approvals
FM approval
FM certificateFM19US0207X
Control drawing116-0035
UL approvalE106378
Control drawing116-0145
Contact loading250 V AC/2 A/cos φ > 0.75; 126.5 V AC/4 A/cos φ > 0.75; 30 V DC/2 A resistive load
CSA approval
Control drawing116-0047
IECEx approval
IECEx certificateIECEx PTB 11.0034 , IECEx TUN 19.0013X
IECEx marking[Ex ia Ga] IIC
[Ex ia Da] IIIC
[Ex ia Ma] I
Ex ec nC IIC T4 Gc
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see


ECLASS 11.027210128
ECLASS 10.0.127210128
ECLASS 9.027210128
ECLASS 8.027210190
ECLASS 5.127210121
ETIM 8.0EC002918
ETIM 7.0EC002918
ETIM 6.0EC002918
ETIM 5.0EC002475
UNSPSC 12.139121007

Details: KFD2-SR2-Ex2.W.SM


This isolated barrier is used for intrinsic safety applications.

This device is a standstill monitor that accepts input frequency pulses and triggers an output when the frequency drops below a preselected limit value.

Two start-up override values are available. This unit can also be used to determine rotation direction.

During an error condition, the relay reverts to its de-energized state and the LEDs indicate the fault according to NAMUR NE 44.

The device has LED status indicators for direction of rotation detection, limit detection, supply, and hardware faults.

The device is easily configured by the use of DIP switches.

If the device is operated via Power Rail, additionally a collective error message is available.

For additional information, refer to

Product Documentation: KFD2-SR2-Ex2.W.SM

Language Selection:
Safety and Security DocumentationLanguageFile TypeFile Size
Instruction manualENGPDF172 KB
Safety instructions standstill controller KFD2-SR2-**-2.W.SMENGPDF108 KB
System Manual ENGPDF3673 KB

Design / Simulation: KFD2-SR2-Ex2.W.SM

Language Selection:
CADLanguageFile TypeFile Size
3-D model / 3-D-ModellALLSTP2510 KB
CAD Portal / CAD PortalALLLINK---
CAE EPLAN Data Portal / CAE EPLAN Data PortalALLLINK---
EPLAN macro P+F.KFD2-SR2-Ex2.W.SM.edz / EPLAN-Makro P+F.KFD2-SR2-Ex2.W.SM.edzALLEDZ1513 KB

Approvals: KFD2-SR2-Ex2.W.SM

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
Australia Test SafeANZEx 17.3006XALLPDF6788 KB
Canada CSACoC 1029981 CALLPDF177 KB
Canada UL cULE106378 cUL (QUZW7)ALLLINK---
China SITIIAS CCC Ex Certificate2020322316001439 (Bintan)ALLPDF1233 KB
Europe PTB ATEX Category (1) D ATEX Category (M1) ATEX Category (1) GPTB 00 ATEX 2080ALLPDF554 KB
Europe TUV II 3 GTÜV 99 ATEX 1493XALLPDF2538 KB
India PESO (India) CCOEA/P/HQ/KA/104/5674 (P440216)ALLPDF968 KB
Korea KOSHA09-AV4BO-0222-1ALLPDF346 KB
PTB IECEx Certificate of ConformityIECEx PTB 11.0034ALLLINK---
South Africa MASCMASC MS/17-0863ALLPDF527 KB
South Africa MASCMASC S/23-8148XALLPDF577 KB
TUV Nord IECEx Certificate of ConformityIECEx TUN 19.0013XALLLINK---
USA Canada UL Hazardous Location Certificate of Compliance cULus UL E106378CoC 20160608 - E106378 RepRef 19970520ALLPDF246 KB
Ukraine SERTIS ExSC 21.0646 XALLPDF12351 KB
exida Functional Safety AssessmentP+F 04/03-14 R017ALLPDF148 KB
Control Drawings
Control Drawing UL / Control Drawing UL   ALLPDF165 KB
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-0170DALLPDF65 KB

Associated Products: KFD2-SR2-Ex2.W.SM

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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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