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Brand: Pepperl+Fuchs
Pepperl+Fuchs KFD2-EB2.R4A.B Redundant Power Feed Module
Description
KFD2-EB2.R4A.B redundant power feed module for the Power Rail
The KFD2-EB2.R4A.B feeds 24 V DC into the Power Rail that supplies K-System isolators, with a maximum of 4 A and a replaceable 5 AT fuse. It is designed for redundant power: two modules are used, each wired to its own supply, and either can carry the rail alone.
It also contains a collective error relay that alerts the controller when any isolator on the rail has a device or wiring fault. In the code, EB2 is the power feed module generation, R4A the 4 A redundant version and B a revision with reversible relay contact. Its sibling KFD2-EB2 has a simpler function.
Seven Star LLC supplies this module in Oman and the GCC as an independent supplier in Muscat.
Technical specifications of the KFD2-EB2.R4A.B
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Pepperl+Fuchs KFD2-EB2.R4A.B |
| Supply | 20 to 30 V DC at terminals 11+/12- and 8+/9-; do not exceed rated voltage of plugged devices |
| Fuse | 5 AT / 250 V AC, replaceable; use max. 80 % of rating |
| Output | Power Rail, max. 4 A; output voltage Ur = Ui – 0.6 V |
| Fault relay | NO contact (reversible by DIP switch): 30 V AC / 2 A (cos φ ≥ 0.7), 40 V DC / 2 A; delay approx. 20 ms |
| Indicators | Green LED power, red LED fault |
| Bus | Rail bus forwarded to terminals 13 and 15 for RS-485 of KFD2-WAC2-Ex1.D; terminal 14 for test |
| Power dissipation | ≤ 2.4 W |
| Functional safety | No dangerous failures; safe state of supplied isolators is the de-energized state |
| Hazardous area data | UL 22 ATEX 2853 X, Ex ec nC IIC T4 Gc, Zone 2 / Div. 2 |
| Ambient temperature | -40 to 60 °C; up to 70 °C with manual mounting conditions |
| Housing | Type B2, 20 x 119 x 115 mm, IP20, approx. 100 g |
How the KFD2-EB2.R4A.B keeps the rail alive
Two KFD2-EB2.R4A.B modules are fitted on the same Power Rail, each connected to an independent 24 V supply. If one supply or module fails, the other continues feeding the rail without interruption. The collective error relay switches on module fault, supply fault or any isolator fault reported over the rail.
The relay output can be set normally open or normally closed, so the alarm logic can be chosen to match the controller. A replaceable fuse provides group fusing for all devices on the rail.
System fit and related parts
Use the KFD2-EB2.R4A.B with Power Rail-compatible K-System modules such as KFD2-STC5-1, KFD2-UT2-Ex1 and KCD2-ST-Ex2. The non-redundant sibling KFD2-EB2 feeds the same rail from a single supply. The UPR-03 rail itself is a separate part, and the manufacturer notes that redundant systems need two feed modules.
Selection and ordering checklist for the KFD2-EB2.R4A.B
- Redundancy: order two modules per rail.
- Total rail current below 4 A.
- Independent supplies, each 20 to 30 V DC.
- Fault relay logic: NO or NC.
- Spare 5 AT fuses.
- Optional RS-485 bus for a KFD2-WAC2-Ex1.D.
Installation, commissioning and maintenance of the KFD2-EB2.R4A.B
Fit the two modules at the ends or as specified in the rail layout, wire each to its own supply, set the relay mode by DIP switch and test by switching off one supply. Confirm that the fault relay signal reaches the controller.
Keep spare fuses and check the fuse state when the red LED is on. Do not exceed the 80 % fuse loading.
Test the alarm path during commissioning by pulling one isolator from the rail and by switching off one supply at a time. Record the relay contact state in each case so the control room operators know what the alarm means when it appears.
Power budget of the rail fed by the KFD2-EB2.R4A.B
Add the supply currents of every module on the rail and compare the total against 4 A with margin. Remember that the KFD2-EB2.R4A.B drops about 0.6 V between its supply and the rail, and that its voltage must not exceed the rated voltage of any plugged-in device.
In redundant use each module should be able to carry the full load, and two supplies on separate circuits protect against loss of one feeder. Where a plant has a UPS and a mains-fed 24 V supply, feeding one module from each gives protection against a failed power supply as well as a failed feeder breaker.
Typical applications in Oman and the GCC
In Oman and the GCC the KFD2-EB2.R4A.B is used in control room marshalling cabinets of oil, gas and power plants, where loss of the 24 V supply for dozens of isolators would shut down a unit.
Family comparison
| Part | Key difference |
|---|---|
| KFD2-EB2.R4A.B (this part) | Redundant feed, 4 A, reversible fault relay |
| KFD2-EB2 | Power feed module, single supply |
| UPR-03 | Power Rail |
| KFD2-WAC2-Ex1.D | Device using the rail RS-485 bus |
Information to send with an RFQ
- Part number KFD2-EB2.R4A.B and quantity (two per redundant rail)
- Total rail current
- Supply voltage
- Fault relay mode
- Delivery location
Site conditions in Oman for the KFD2-EB2.R4A.B
Electrical rooms and outdoor panels in the Gulf often operate well above the 25 °C reference temperature used in many catalogues. Before you finalise the KFD2-EB2.R4A.B, compare the expected panel temperature with the operating range and any output derating stated in the manufacturer documentation, and leave the recommended clearance above and below the device for convection. Supply quality also varies between sites, so confirm the input voltage range, frequency and any requirements for protection on the supply side.
Where the device feeds or monitors critical loads, plan how faults will be signalled to the control system and how a replacement can be installed quickly. Keeping one spare KFD2-EB2.R4A.B per site and recording its settings helps maintenance teams in Oman restore service with minimum downtime.
Documents and quotation
The manufacturer datasheet for KFD2-EB2.R4A.B is attached on this page, so you can check wiring, approvals and dimensions before ordering. Send the exact part number, quantity and delivery location in Oman or the GCC and Seven Star LLC will reply with a quotation.
Seven Star LLC is an independent supplier in Muscat and is not the manufacturer; confirm availability, lead time and any project approval requirements in your RFQ.
Datasheets & Documents
- Datasheet Pepperl+Fuchs KFD2-EB2.R4A.B Datasheet Download
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About brand
Pepperl+Fuchs is a German manufacturer of industrial sensors and explosion protection equipment, founded in 1945 in Mannheim by Walter Pepperl and Ludwig Fuchs as a radio repair shop. Defective transformers led them into manufacturing, and the company developed its first proximity switch in the late 1950s. Pepperl+Fuchs is headquartered in Mannheim and is a pioneer of intrinsically safe electrical equipment for hazardous areas.
Seven Star LLC lists Pepperl+Fuchs sensors, isolated barriers, power supplies and hazardous-area mobile devices, and supplies them to instrument and automation teams in Oman by exact model designation.
Pepperl+Fuchs company profile
| Founded | 1945, Mannheim-Sandhofen, Germany, by Walter Pepperl and Ludwig Fuchs |
|---|---|
| Headquarters | Mannheim, Germany |
| Ownership | Privately owned (Pepperl+Fuchs SE) |
| Origins | Radio repair workshop that began making replacement transformers |
| Product families | Inductive, capacitive, ultrasonic and photoelectric sensors, rotary encoders, R2000 LiDAR scanners, KFD and HiC isolated barriers, Zener barriers, remote I/O, purge and pressurization systems, Ex-rated enclosures |
Milestones
- 1945: Walter Pepperl and Ludwig Fuchs open their radio repair shop in Mannheim.
- 1958: The first proximity switch is developed (some company sources say 1959).
Pepperl+Fuchs product families on this page
On the interface side there are two systems. The K-System mounts on DIN rail and is represented here by the KFD2-UT2-Ex2 universal temperature converter. The H-System plugs into termination boards and is represented by the HiD2030 SMART transmitter power supply with HART. The PS1000-A6-24.20 is a 24 VDC, 20 A power supply for cabinets. Sensors listed include the NJ2-12GK-SN NAMUR inductive sensor, the R101 retro-reflective photoelectric sensor and the R2000 2-D LiDAR scanner. For field staff there are the Tab-Ex 05 DZ1 tablet for Zone 1/21 areas and the Smart-Ex 03 DZ2 smartphone for Zone 2/22 and Division 2 areas.
Where Pepperl+Fuchs equipment is used
Isolated barriers sit between field instruments in Zone 0 or Zone 1 and the DCS or safety system in refineries, gas plants and chemical works. NAMUR sensors report valve position and machine states in classified areas. Photoelectric sensors and LiDAR scanners work in conveying, packaging, warehousing and vehicle guidance. Ex-rated tablets and phones are carried on operator rounds and maintenance jobs.
Pepperl+Fuchs products we list
Ordering Pepperl+Fuchs parts: what we need
Send the complete model designation as printed on the device, including every suffix; a single letter can change the supply voltage or the output type. Add the part number if the label shows one. For barriers, tell us the field device and signal type, the number of channels and whether the safety loop needs a SIL-assessed module. For mobile devices, state the zone or division and the regional radio version.
Facts checked against Pepperl+Fuchs's own chronicle pages, October 2026.
Browse Pepperl+Fuchs products by category: Sensors & Transmitters, Industrial Computer, Isolator & Barrier, Power Modules.
FAQ
Questions about the Pepperl+Fuchs KFD2-EB2.R4A.B Redundant Power Feed
Answers from our engineering team on installation, compatibility and integration.
01What does the KFD2-EB2.R4A.B do?
It feeds 24 V DC to a Power Rail with up to 4 A and supports redundant supply with two modules.
02What fuse does it use?
A replaceable 5 AT / 250 V AC fuse; the recommended maximum utilization is 80 %.
03How are faults reported?
By a collective error relay with a reversible NO or NC contact rated 40 V DC / 2 A, plus red and green LEDs.
04Does it affect SIL calculations?
The datasheet says it provides no dangerous failures, so it does not influence the safety calculation of the isolators.
05What temperature range applies?
-40 to 60 °C, up to 70 °C with the mounting conditions in the manual.
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