Serviceline Industrial Sensors
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Tech phone: 0161 622 6311
Fax: 0161 624 6537
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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 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) , 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)GD, [Ex ia Ga] IIC, [Ex ia Da] IIIC, (-20 °C ≤ Tamb ≤ 60 °C) [circuit(s) in zone 0/1/2]
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 [device in zone 2]
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
Optional accessories- power feed module KFD2-EB2(.R4A.B)(.SP)
- universal power rail UPR-03(-M)(-S)
- profile rail K-DUCT-BU(-UPR-03)


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

Documents: KFD2-VR4-Ex1.26

ManualsLanguageFile TypeFile Size
Functional Safety ManualENGPDF1975 KB
System Manual ENGPDF3524 KB
Handbuch Funktionale SicherheitGERPDF1988 KB
SystemhandbuchGERPDF3557 KB
Instruction manuals
ИнструкцииBULPDF135 KB
Návod k poużitíCZEPDF131 KB
Instruktions manualDANPDF129 KB
Instruction manualENGPDF135 KB
KasutusjuhendESTPDF0 KB
KäyttöohjeFINPDF0 KB
Manuel d'instructionsFRAPDF131 KB
BetriebsanleitungGERPDF135 KB
Οδηγίες χρήσηςGREPDF138 KB
HandleidingHOLPDF130 KB
Instruction manual / BetriebsanleitungHRVPDF0 KB
Használati útmutatóHUNPDF0 KB
Manuale di istruzioniITAPDF130 KB
Lietošanas pamācībaLAVPDF129 KB
Instrukciju vadovasLITPDF0 KB
Instrukcja obsługiPOLPDF131 KB
Manual de instruçõesPORPDF130 KB
Manual de utilizareRONPDF130 KB
Návod na poużitieSLKPDF130 KB
Navodila za uporaboSLVPDF128 KB
Manual de instruccionesSPAPDF130 KB
ManualSWEPDF127 KB

Approvals+Certificates: KFD2-VR4-Ex1.26

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-4401PDF58 KB
Australia Test SafeANZEx 17.3006XPDF6788 KB
Baseefa IECEx Certificate of ConformityIECEx BAS 05.0078LINK---
Baseefa Type n IECEx Certificate of ConformityIECEx BAS 10.0085XLINK---
Belarus Pattern ApprovalNr. 11709PDF15640 KB
Brasil TUV Rheinland BrazilTÜV 14.0355PDF483 KB
Canada UL cULE106378 cUL (QVAJ7)LINK---
Canada UL cULE106378 cUL (QUZW7)LINK---
EAC Pepperl+Fuchs EAC TP TC 020/2011EAEC N RU D-DE.PA01.B.95500/21PDF748 KB
Europe Baseefa II (1) D II (1) GBAS 02 ATEX 7206PDF3113 KB
Europe DEKRA EXAM ATEX Category (M1)DMT 01 ATEX E 133PDF1310 KB
Europe TUV Nord ATEX Category 3 GTÜV 99 ATEX 1499XPDF1999 KB
India PESO (India) CCOEA/P/HQ/KA/104/5530 (P404194)PDF864 KB
Korea KOSHA12-AV4BO-0394PDF1179 KB
Pepperl+Fuchs Functional Safety AssessmentFS-0040PF-20BPDF107 KB
Russia Belarus Kazakhstan EAC EAC TP TC 012/2011EAEC RU C-DE.EX01.B.00102/19PDF9815 KB
Russia VNIIMS Pattern ApprovalOC.C.34.004.A No.56757PDF6680 KB
South Africa MASCMASC MS/17-0877PDF488 KB
South Africa MASCMASC M/17-0784PDF2057 KB
United Arab Emirates SGS Gulf Limited ECASEx21-06-15615/E21-06-033081PDF648 KB
Control drawings
Control drawing UL / Control drawing UL   PDF41 KB

Associated Products: KFD2-VR4-Ex1.26

Matching System Components

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Function: 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.