Release date  2012-07-06 08:53 Date of issue  2012-07-17 132960_eng.xml
KFD2-SR2-Ex2.W
Subject to reasonable modifications due to technical advances.  Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com 1
Switch Amplifier
2+
3-1+
Zone 2
Div. 2
Zone 0, 1, 2
Div. 1, 2
KFD2-SR2-Ex2.W
7
8
9
10
11
12
I
II
I
II
24 V DC
14+
15-Power Rail
24 V DC ERR
5+
6-4+
10 kΩ
10 kΩ
400  Ω ≤ R ≤ 2 k Ω
10 kΩ
10 kΩ
400  Ω ≤ R ≤ 2 k Ω
Connection
Assembly
• 2-channel isolated barrier
• 24 V DC supply (Power Rail)
• Dry contact or NAMUR inputs
• Relay contact output
• Line fault detection (LFD)
• Reversible mode of operation
• Up to SIL2 acc. to IEC 61508
Function
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.
The proximity sensor or switch controls a form C changeover
relay contact for the safe area load. The normal output state
can be reversed using switches S1 and S2. Switch S3 is used
to enable or disable line fault  detection of the field circuit.
During an error condition, the relays revert to their de-energized state and the LEDs in dicate the fault according to
NAMUR NE44.
A unique collective error messaging feature is available when
used with the Power Rail system.
Features
1 3
4 6
2
5
13 15
12
9
10
7
14
11
8
KFD2-SR2-Ex2.W
1
2
OUT CHK PWR
S2
S1
S3
II I
Front view
LED yellow:
Relay output  Ι
LED red:
LB/SC channel  Ι
LED yellow:
Relay output  ΙΙ
LED red:
LB/SC channel  ΙΙ
Switch S3
(LB/SC-monitoring)
LED green:
Power supply
Removable terminals
green
Removable terminals
blue
Switch S1
(Mode of operation channel  Ι)
Switch S2
(Mode of operation channel  ΙΙ )
2
Release date  2012-07-06 08:53 Date of issue  2012-07-17 132960_eng.xml
Technical data KFD2-SR2-Ex2.W
Subject to reasonable modifications due to technical advances.  Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com 2
General specifications
Signal type  Digital Input
Supply
Connection  Power Rail or terminals 14+, 15-Rated voltage  20 ... 30 V DC
Ripple  ≤  10  %
Rated current  ≤  50 mA
Power loss  1 W
Power consumption  < 1.3 W
Input
Connection  terminals 1+, 2+, 3-; 4+, 5+, 6-Rated values  acc. to EN 60947-5-6 (NAMUR)
Open circuit voltage/short-circuit current  approx. 8 V DC / approx. 8 mA
Switching point/switching hysteresis  1.2 ... 2.1 mA / approx. 0.2 mA
Line fault detection  breakage I  ≤ 0.1 mA , short-circuit I > 6 mA
Pulse/Pause ratio  ≥  20 ms /  ≥  20 ms
Output
Connection  output I: terminals 7, 8, 9 ; output II: terminals 10, 11, 12
Output I, II  signal, relay
Minimum switch current  2 mA / 24 V DC
Energized/De-energized delay  approx. 20 ms / approx. 20 ms
Mechanical life  10
7
 switching cycles
Transfer characteristics
Switching frequency  ≤  10 Hz
Electrical isolation
Input/Output  reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V
eff
Input/power supply  reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V
eff
Output/power supply  reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V
eff
Output/Output  reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V
eff
Directive conformity
Electromagnetic compatibility  
Directive 2004/108/EC  EN 61326-1:2006
Low voltage  
Directive 2006/95/EC  EN 61010-1:2010
Conformity
Electromagnetic compatibility  NE 21:2006
Protection degree  IEC 60529:2001
Input EN 60947-5-6:2000
Ambient conditions
Ambient temperature  -20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Protection degree  IP20
Mass  approx. 150 g
Dimensions  20 x 119 x 115 mm (0.8 x 4.7 x 4.5 in) , housing type B2
Mounting  on 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection
with Ex-areas
EC-Type Examination Certificate  PTB 00 ATEX 2080 , for additional certificates see www.pepperl-fuchs.com
Group, category, type of protection  ¬ II (1) G [Ex ia] IIC, II (1) D [Ex ia] IIIC
Input  [Ex ia] IIC, [Ex ia] IIIC
Voltage U
o
 10.5 V
Current I
o
  13 mA
Power P
o
  34 mW (linear characteristic)
Supply  
Maximum safe voltage  U
m
253 V AC / 125 V DC (Attention! U
m
 is no rated voltage.)
Output  
Contact loading  253 V AC/2 A/cos  φ  > 0.7; 126.5 V AC/4 A/cos  φ > 0.7; 40 V DC/2 A resistive load
Maximum safe voltage  U
m
253 V AC (Attention! The rated voltage can be lower.)
Statement of conformity  Pepperl+Fuchs
Group, category, type of protection  ¬ II (3)G [Ex ic] IIC; [Ex nL] IIC
Input  [Ex ic] IIC; [Ex nL] IIC
Voltage U
o
10.5 V
Current I
o
13 mA
Power P
o
34 mW (linear characteristic)
Release date  2012-07-06 08:53 Date of issue  2012-07-17 132960_eng.xml
Technical data KFD2-SR2-Ex2.W
Subject to reasonable modifications due to technical advances.  Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com 3
Output 
Contact loading  253 V AC/2 A/cos φ  > 0.7; 126.5 V AC/4 A/cos  φ > 0.7; 40 V DC/2 A resistive load
Statement of conformity  TÜV 99 ATEX 1493 X , observe statement of conformity
Group, category, type of protection,
temperature class
¬ II 3G Ex nA nC IIC T4
Output 
Contact loading  50 V AC/4 A/cos φ > 0.7; 40 V DC/2 A resistive load
Electrical isolation  
Input/Output  safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Input/power supply  safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Directive conformity  
Directive 94/9/EC  EN 60079-0:2009, EN 60079-11:2007 , EN 60079-15:2005 , EN 61241-11:2006
International approvals
FM  approval  
Control drawing  116-0035
CSA approval  
Control drawing  116-0047
IECEx approval  IECEx PTB 11.0034
Approved for  [Ex ia] IIC , [Ex ia] IIIC , [Ex ia] I
General information
Supplementary information  EC-Type Examination Certificate, Statement of Conf ormity, Declaration of Conformity, Attestation of
Conformity and instructions have to be observed where applicable. For information see www.pepperl-fuchs.com.
Release date  2012-07-06 08:53 Date of issue  2012-07-17 132960_eng.xml
Technical data KFD2-SR2-Ex2.W
Subject to reasonable modifications due to technical advances.  Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com 4
Power feed module KFD2-EB2
The power feed module is used to supply  the devices with 24 V DC via the Power Ra il. The fuse-protected power feed module
can supply up to 150 individual devices depending on the power co nsumption of the devices. A galvanically isolated mechanical
contact uses the Power Rail to transmit collective error messages.
Power Rail UPR-03
The Power Rail UPR-03 is a complete unit consisting of the electrical inset and an  aluminium profile rail 35 mm x 15 mm. To make
electrical contact, the de vices are simply engaged.
Profile Rail K-DUCT with Power Rail
The profile rail K-DUCT is an aluminum profile rail with Power Ra il insert and two integral cable ducts for system and field cab les.
Due to this assembly no additional cable guides are necessary.
Power Rail and Profile Rail must not be fed via the device terminals of the individual devices!
Configuration
789
10 11 12
123
456
13 14 15
1
2
PWR CHK OUT
S1
S2
S3
123
123
S1
S3
II
S2
I
Switch position
Operating status
Factory settings: switch 1, 2 and 3 in position I
S Function Position
1 Mode of operation
Output I (relay)
energized
with high input current I
with low input current II
2 Mode of operation
Output II (relay)
energized
with high input current I
with low input current II
3 Line fault detection ON I
OFF II
Control circuit Input signal
Initiator high impedance/
contact opened
low input current
Initiator low impedance/
contact closed
high input current
Lead breakage,
lead short-circuit
Line fault
Accessories