Serviceline Industrial Sensors
Serviceline Explosion Protection

Switch Amplifier KFD2-SRA-Ex4

  • 4-channel isolated barrier
  • 24 V DC supply (Power Rail)
  • Dry contact or NAMUR inputs
  • 50 % less wiring, 2:1 technology
  • Relay contact output
  • Line fault detection (LFD)
  • Reversible mode of operation

Download the complete datasheet as a PDF:

Datasheet excerpt: Technical data of KFD2-SRA-Ex4

General specifications
Signal typeDigital Input
ConnectionPower Rail or terminals 14+, 15-
Rated voltage19 ... 30 V DC
Ripple≤ 10 %
Rated current45 ... 70 mA
Power dissipation1.2 W
Connection sidefield side
Connectionterminals 1-, 2+, 3-; 4-, 5+, 6-
Rated valuesacc. to EN 60947-5-6 (NAMUR), see system description 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
Pulse/Pause ratiomin. 35 ms / min. 35 ms (non-AC operation) min. 70 ms / min. 70 ms (AC operation)
Line fault detectionbreakage I ≤ 0.15 mA , short-circuit I > 6 mA
Connection sidecontrol side
Connectionoutput I: terminals 7, 8 ; output II: terminals 8, 9 ; output III: terminals 10, 11 ; output IV: terminals 11, 12
Output I ... IVSignal I ... Signal IV ; relay
Contact loading253 V AC/2 A /cos φ > 0.7; 40 V DC/2 A resistive load;
Energized/De-energized delayapprox. 30 ms / approx. 30 ms
Mechanical life5 x 106 switching cycles
Collective error messagePower Rail
Transfer characteristics
Switching frequency≤ 10 Hz (non-AC operation) ≤ 3 Hz (AC operation)
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/Outputbasic 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) , 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 CertificateZELM 99 ATEX 0009
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 IIC
Voltage10 V
Current14 mA
Power35 mW (linear characteristic)
Maximum safe voltage40 V DC (Attention! Um is no rated voltage.)
Contact loading230 V AC + 10 % / 2 A / 100 VA / cos φ ≥ 0.7; 40 V DC / 2 A resistive load
Fault indication output
Maximum safe voltage40 V DC
Galvanic isolation
Input/inputnot available
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 60079-26:2007 , EN 50303:2000
International approvals
UL approval
Control drawing116-0145
IECEx approvalIECEx TUN 04.0003
Approved for[Ex ia Ga] IIC , [Ex ia Da] IIIC , [Ex ia Ma] I
General information
Supplementary informationObserve the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see

Documents: KFD2-SRA-Ex4

ManualsLanguageFile TypeFile Size
Manual Isolated Barriers K-systemENGPDF760 KB
Manuel pour Barrières Isolées de Système KFRAPDF759 KB
Handbuch Trennbarrieren K-SystemGERPDF745 KB
Manual Isolated Barriers K-systemRUSPDF4107 KB
Instructions, short instructions, safety information
ИнструкцииBULPDF62 KB
Návod k poużitíCZEPDF57 KB
Instruktions manualDANPDF55 KB
Instruction manualENGPDF49 KB
KasutusjuhendESTPDF53 KB
KäyttöohjeFINPDF53 KB
Manuel d'instructionsFRAPDF91 KB
BetriebsanleitungGERPDF51 KB
Οδηγίες χρήσηςGREPDF65 KB
HandleidingHOLPDF67 KB
Instruction manual / BetriebsanleitungHRVPDF65 KB
Használati útmutatóHUNPDF66 KB
Manuale di istruzioniITAPDF89 KB
Lietošanas pamācībaLAVPDF65 KB
Instrukciju vadovasLITPDF65 KB
Instrukcja obsługiPOLPDF68 KB
Manual de instruçõesPORPDF68 KB
Manual de utilizareRONPDF67 KB
Návod na poużitieSLKPDF126 KB
Manual de instruccionesSPAPDF91 KB

Approvals+Certificates: KFD2-SRA-Ex4

Statements of complianceCertificate No.File TypeFile Size
EU-Declaration of conformity / EU-KonformitätserklärungDOC-0255APDF72 KB
Australia SIMTARSANZEx 13.2005PDF101 KB
Canada UL cULE106378 cUL (QUZW7)LINK---
EAC EAC TP TC 020/2011TC RU C-DE.MH04.B.00397PDF680 KB
Europe ZELM ATEX Category (1) GD ATEX Category (M1)ZELM 99 ATEX 0009PDF1585 KB
India PESO (India) CCOEA/P/HQ/KA/104/5561 (P412681)PDF966 KB
Russia Belarus EAC Kazakhstan NANIO "CCVE"TC RU C-IT.GB05.B.00718PDF2731 KB
TUV Nord IECEx Certificate of ConformityIECEx TUN 04.0003LINK---
Control drawings
Control Drawing UL / Control Drawing UL   PDF165 KB