KFD2-EB2.R4A.B, Redundant Power Feed Module

Mfr.: Pepperl+Fuchs Process Automation

Mfr. Model #: KFD2-EB2.R4A.B

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Redundant Power Feed Module, KFD2-EB2.R4A.B

  • Interface for Power Rail
  • Used for redundant configuration
  • Supply current ≤ 4 A
  • Replaceable fuse
  • Relay contact output, reversible
  • LED status indication

The power feed module supplies the Power Rail with a voltage of 24 V DC and a maximum current of 4 A. The device is designed for applications requiring redundant power.

In the event of a device fault or a wiring fault of any isolator on the Power Rail, the collective error messaging relay alerts the controller via a binary I/O point. This relay can be configured as normally-open or normally-closed.

A green LED on the front of the device indicates the power state, and a red LED lights up during a fault condition.

Additionally, the bus implemented in the Power Rail is forwarded to the terminals 13 and 15 for usage with the RS-485 connection of the KFD2-WAC2-Ex1.D device. Terminal 14 is only for test purposes.

In the sense of functional safety (SIL) the device provides no dangerous failures. Thereby the safe condition of the supplied isolators must be defined as the de-energized state. Thus the device will not influence the safety calculation or the SIL value.

This device is compatible with all versions of the Power Rail and provides group fusing.

Note: Redundant systems require 2 KFD2-EB.R4A.B power feed modules.


Product Description
Power feed module, redundant supply
Connection terminals 11+, 12-
terminals 8+, 9-
Rated voltage 20 ... 30 V DC
The maximum rated operating voltage of the devices plugged onto the Power Rail must not be exceeded.
Fusing 5 AT/250 V AC
recommended maximum utilization of the fuse: 80 %
Power dissipation ≤ 2.4 W
Connection Power Rail
Output rated operating current max. 4 A
Output voltage Ui ≥ rated voltage Ur = Ui - 0.6 V
Fault signal relay output: NO contact
Contact loading 30 V AC/ 2 A / cos φ ≥ 0.7 ; 40 V DC/ 2 A
Energized/De-energized delay approx. 20 ms / approx. 20 ms
Display elements LEDs
Control elements DIP-switch
Configuration via DIP switches
Labeling space for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EU EN 61326-1:2013 (industrial locations)
Electromagnetic compatibility NE 21:2006
Degree of protection IEC 60529:2001
Ambient conditions
Ambient temperature -20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protection IP20
Connection screw terminals
Mass approx. 100 g
Dimensions 20 x 119 x 115 mm (0.8 x 4.7 x 4.5 inch) , housing type B2
Mounting on 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
Certificate TÜV 00 ATEX 1618 X
Marking Ex-Hexagon# II 3G Ex nA nC IIC T4
Directive conformity
Directive 2014/34/EU EN 60079-0:2012+A11:2013 , EN 60079-15:2010
International approvals
FM approval
Control drawing 116-0160
IECEx approval IECEx UL 16.0051X
Approved for Ex nA nC IIC T4 Gc
General information
Supplementary information Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see www.
Optional accessories - universal power rail UPR-03(-M)(-S)
- universal power rail UPR-05(-S)
- profile rail K-DUCT-GY(-UPR-03)
- profile rail K-DUCT-GY(-UPR-05)
- profile rail K-DUCT-BU(-UPR-03)
- profile rail K-DUCT-BU(-UPR-05)

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