Serviceline Industrial Sensors
Sales phone: 0161 622 6308
Tech phone: 0161 622 6311
Fax: 0161 624 6537
Serviceline Explosion Protection
Sales phone: 0161 622 6309
Tech phone: 0161 622 6313
Fax: 0161 624 6537

Voltage Repeater KFD2-VR4-Ex1.26

  • 1-channel isolated barrier
  • 24 V DC supply (Power Rail)
  • Voltage input 0 V ... -20 V
  • Vibration sensor inputs
  • Voltage/current field supply
  • Voltage output 0 V ... -20 V
  • 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-VR4-Ex1.26

General specifications
Signal typeAnalog input
Functional safety related parameters
Safety Integrity Level (SIL)SIL 2
ConnectionPower Rail or terminals 11+, 12-
Rated voltage19 ... 30 V DC
Ripplewithin the supply tolerance
Power dissipation≤ 1.2 W
Power consumption≤ 1.6 W
Connection sidefield side
Connectionterminals 4 (common), 1, 3 and 5 (supply -), 2 and 6 (signal -)
Input resistance10 kΩ terminals 4 (common), 6-/2-
Output rated operating currentterminals 4 (common), 5-: > 10 mA at -21 V or > 20 mA at -18 V
terminals 4 (common), 1-: 5.3 mA ±0.4 mA at -10 V
terminals 4 (common), 3-: 3.6 mA ±0.7 mA at -10 V, 20 °C (68 °F)
Transmission range-20 ... 0 V
Connection sidecontrol side
Connectionterminals 7-, 8+
Voltage-20 ... 0 V
Load≥ 9 kΩ (3-wire sensor), ≥ 2 kΩ (2-wire sensor)
Output resistance24 Ω typ., 27 Ω maximum
Since this is much less than the end-to-end resistance of a zener barrier, it may be necessary to specify a monitor intended for use without a barrier. Please follow the advice of the monitor manufacturer.
Transfer characteristics
Cut-off frequency10 kHz (-0,1 dB)
20 kHz (-1 dB)
DeviationDC transfer error (with 10 kΩ load) < 10mV
After calibrationadditional error with AC superimposed is ±5 mV at 20 °C (68 °F) at any point within the span, provided that the alternating component of the input voltage is not excessive, e. g.
- square waves (0 ... 20 kHz): 5 Vpp
- sine waves (0 ... 20 kHz): the full span of 20 Vpp (= 100 g peak acceleration at 100 mV/g) is acceptable.
Influence of ambient temperature(< 100 ppm of span)/K at any point within the span
Time delay relative to input7.1 ±0.3 µs
Ripplein 200 kHz bandwidth < 20 mVrms
in 20 kHz bandwidth < 3 mVrms
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 21:2017
EN IEC 61326-3-2:2018
Degree of protectionIEC 60529
Protection against electrical shockUL 61010-1
Ambient conditions
Ambient temperature-20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protectionIP20
Connectionscrew terminals
Massapprox. 125 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 certificateBAS 02 ATEX 7206
MarkingEx-Hexagon II (1)G [Ex ia Ga] IIC , Ex-Hexagon II (1)D [Ex ia Da] IIIC
InputEx ia Ga, Ex ia Da
Voltage-26.4 V
Current90 mA
Power570 mW
Maximum safe voltage253 V (Attention! The rated voltage can be lower.)
Maximum safe voltage253 V (Attention! The rated voltage is 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 galvanic isolation acc. to IEC 60079-11, voltage peak value 375 V
Input/power supplysafe galvanic isolation acc. to IEC 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
UL approval
Control drawing116-0316 (cULus)
IECEx approval
IECEx certificateIECEx BAS 05.0078
IECEx BAS 10.0085X
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


ECLASS 11.027210120
ECLASS 10.0.127210120
ECLASS 9.027210120
ECLASS 8.027210120
ECLASS 5.127210120
ETIM 8.0EC002653
ETIM 7.0EC002653
ETIM 6.0EC002653
ETIM 5.0EC001485
UNSPSC 12.132101514

Details: KFD2-VR4-Ex1.26


This isolated barrier is used for intrinsic safety applications. It provides a floating output to power a vibration sensor (e. g., Bently Nevada) or accelerometer in a hazardous area and transfers the voltage signal from that sensor to the safe area.

The device is designed to provide a voltage or current supply to the vibration sensor. Depending on connection the barrier provides 3.6 mA, 5.3 mA, or 8.9 mA supply current for 2-wire sensors, or 18 V at 20 mA for 3-wire sensors.

Product Documentation: KFD2-VR4-Ex1.26

Language Selection:
Safety and Security DocumentationLanguageFile TypeFile Size
Instruction manualENGPDF167 KB
Functional Safety ManualENGPDF1975 KB
System Manual ENGPDF3673 KB

Design / Simulation: KFD2-VR4-Ex1.26

Language Selection:
CADLanguageFile TypeFile Size
3-D model / 3-D-ModellALLSTP2510 KB
CAE EPLAN Data Portal / CAE EPLAN Data PortalALLLINK---
EPLAN macro P+F.KFD2-VR4-Ex1.26.edz / EPLAN-Makro P+F.KFD2-VR4-Ex1.26.edzALLEDZ1374 KB

Approvals: KFD2-VR4-Ex1.26

Language Selection:
CertificatesCertificate No.LanguageFile TypeFile Size
Australia Test SafeANZEx 17.3006XALLPDF6788 KB
Baseefa IECEx Certificate of ConformityIECEx BAS 05.0078ALLLINK---
Baseefa Type n IECEx Certificate of ConformityIECEx BAS 10.0085XALLLINK---
Brasil TUV Rheinland BrazilTÜV 14.0355ALLPDF483 KB
Canada UL cULE106378 cUL (QVAJ7)ALLLINK---
Canada UL cULE106378 cUL (QUZW7)ALLLINK---
China SITIIAS CCC Ex Certificate2020322316001400 (Singapore)ALLPDF1013 KB
Europe Baseefa II (1) D II (1) GBAS 02 ATEX 7206ALLPDF3113 KB
Europe DEKRA EXAM ATEX Category (M1)DMT 01 ATEX E 133ALLPDF1310 KB
Europe TUV Nord ATEX Category 3 GTÜV 99 ATEX 1499XALLPDF1999 KB
India PESO (India) CCOEA/P/HQ/KA/104/5926 (P523617)ALLPDF77 KB
Japan TIISTC22384ALLPDF3060 KB
Korea KOSHA12-AV4BO-0394ALLPDF1179 KB
Pepperl+Fuchs Functional Safety AssessmentFS-0040PF-20BALLPDF107 KB
South Africa MASCMASC M/17-0784ALLPDF253 KB
South Africa MASCMASC MS/17-0877ALLPDF230 KB
United Arab Emirates SGS Gulf Limited ECASEx22-09-51653/E22-09-051954ALLPDF850 KB
United Kingdom CML UK-Type Examination Certificate UKEX Category (1) G UKEX Category (1) DCML 21UKEX2942 ALLPDF155 KB
Control Drawings
Control drawing UL / Control drawing UL   ALLPDF41 KB
Declaration of Conformity
EU-Declaration of conformity / EU-KonformitätserklärungDOC-4401AALLPDF84 KB
UK-Declaration of conformity / UK-KonformitätserklärungDOC-5679ALLPDF73 KB

Associated Products: KFD2-VR4-Ex1.26

Matching System Components
Cable trunking is integrated in the mounting profile, Safe spacious separation of safe and hazardous signals, No additional cable guides necessary, Standard length 1.8 m (5.8 ft), simple to customize to application space, With mounting aidspa
Cable trunking with integrated Power Rail UPR-03, Safe spacious separation of safe and hazardous signals, No additional cable guides necessary, Provides DC supply voltage to all equipped K-System modules, Standard length 1.8 m (5.8 ft), simple to customize to application space, With end caps UPR-E, cover and mounting aidspa
3-pin screw terminal, For KF modules of K-System, Packaging unit: 5 pieces greenpa
Coding of K-System terminal blocks, Coding of LB/FB-System front sockets, Packaging unit: 20 x 6 coding pinspa
Safety Products Selector

Choose from various selection criteria like safety integrity level, performance level, device function, and signal type and find the SIL/PL assessed device that you are looking for.