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Brand: Pepperl+Fuchs
Pepperl+Fuchs KFD0-RSH-1.4S.PS2 SIL 3 Relay Module
Description
KFD0-RSH-1.4S.PS2 SIL 3 fail-safe relay module for safety outputs
The KFD0-RSH-1.4S.PS2 is a one-channel relay module that lets a 24 V DC safety output of a control system switch a load circuit up to 230 V. It isolates the control side from the load, and it has two relay outputs of diverse design that can be used for energized-to-safe, de-energized-to-safe or dual-pole switching.
The datasheet names Yokogawa ProSafe DO cards SDV531 and SDV541 and the Honeywell DO card SDO-0824 as compatible controls; other ESD or DCS systems have to be checked with the manufacturer. In the part number, KFD0 is the loop-powered family, RSH marks the safety relay module and PS2 the version for the listed safety output cards.
Seven Star LLC supplies this module in Oman and the GCC as an independent supplier in Muscat.
Technical specifications of the KFD0-RSH-1.4S.PS2
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Pepperl+Fuchs KFD0-RSH-1.4S.PS2 |
| Safety | SIL 3 acc. to IEC/EN 61508; ETS function with output I and DTS function with output II permitted for SIL 3; dual pole switching with I and II |
| Input | Non-polarized logic input at terminals 7 and 8; 0-signal -3 to 3 V DC, 1-signal 20 to 26.5 V DC; 45 to 50 mA; loop powered |
| Test input | Terminals 10, 11, 12 for relay check; test mode shown by LEDs per NAMUR NE 44 |
| Output I (ETS) | Terminals 2, 3 |
| Output II (DTS) | Terminals 4, 5, 6; protected against contact welding by a fuse |
| Contact rating | 253 V AC / 5 A (cos φ 0.7); 30 V DC / 5 A resistive; minimum 2 mA at 24 V DC |
| Timing | Energize delay approx. 10 ms, de-energize delay approx. 5 ms; switching frequency below 10 Hz; mechanical life 5 x 106 cycles |
| Fuse | 2.5 A, max. 5 A; recommended maximum use 80 % |
| Power | Dissipation and consumption below 1.5 W |
| Isolation | Input to output and output to output: reinforced insulation, 300 V rms |
| Ambient temperature | -20 to 60 °C |
| Housing | Type B2, 20 x 119 x 115 mm, IP20, approx. 100 g |
How the KFD0-RSH-1.4S.PS2 provides safe switching
The module has two relays of diverse design, meaning different construction, acting on the same load circuit. In energized-to-safe use, output I switches the load on only when the safety card energizes the input; in de-energized-to-safe use, output II lets the load run until the input drops. A dual-pole arrangement opens both the supply and the return conductor.
Test pulses from the safety output card are tolerated, so the diagnostic pulses used by many safety cards do not trip the relay. The test terminals let maintenance verify that each relay still opens and closes as expected.
System fit and related parts
The KFD0-RSH-1.4S.PS2 is typically used between an ESD system and valves, motor starters or horns. It is a different product from the KFD2-SR2-Ex1.W or KFD2-ST3-Ex2, which are intrinsically safe isolators for sensors. For simple non-safety relay duty, the KFD2-EB-type modules or other switch amplifiers are enough.
Selection and ordering checklist for the KFD0-RSH-1.4S.PS2
- Control card model and its test pulse behavior.
- Load voltage and current within 5 A and the fuse rating.
- Which safe state is needed: energized-to-safe or de-energized-to-safe.
- Single or dual pole switching.
- SIL calculation inputs from the functional safety manual.
- Rail space of 20 mm.
Installation, commissioning and maintenance of the KFD0-RSH-1.4S.PS2
Wire input terminals 7 and 8 to the safety output, the load to terminals 2 and 3 or 4, 5 and 6 according to the chosen function, and use terminals 10 to 12 for the test routine. Use the safety manual for proof test intervals and failure data.
Check the fuse before use and do not exceed 80 % of its rating. After any load fault, replace the fuse and check the contact before returning the loop to service.
Safety loop practice with the KFD0-RSH-1.4S.PS2
A safety loop is only as reliable as its weakest component, so include the relay module in the PFD calculation with the data of the safety manual. Proof test the relay on the schedule of the safety requirement specification, using the test terminals where possible.
Keep field wiring and control wiring physically separated to preserve the isolation rating, and mark the module as a safety component on the cabinet drawing.
Before first start-up, simulate a safety trip from the control system and confirm with a meter that both relay outputs open or close as the chosen function requires. Document the result in the safety loop test record, together with the fuse rating installed and the load that is connected.
Typical applications in Oman and the GCC
The KFD0-RSH-1.4S.PS2 fits shutdown valves, burner management, emergency stop and fire and gas final elements at oil and gas facilities, power plants and petrochemical sites in Oman and the GCC, where the safety card cannot switch 230 V loads directly.
Family comparison
| Part | Key difference |
|---|---|
| KFD0-RSH-1.4S.PS2 (this part) | SIL 3 relay, ETS/DTS/DPS, for listed safety cards |
| KFD2-SR2-Ex2.W | Switch amplifier for Ex ia sensors |
| KFD2-ER-1.W.LB | Conductive level switch amplifier |
| KFD2-EB2.R4A.B | Redundant power feed module |
Information to send with an RFQ
- Part number KFD0-RSH-1.4S.PS2 and quantity
- Control system and card model
- Load voltage and current
- Required safe state
- Single or dual pole
- Delivery location
Documents and quotation
The manufacturer datasheet for KFD0-RSH-1.4S.PS2 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 KFD0-RSH-1.4S.PS2 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 KFD0-RSH-1.4S.PS2 SIL 3 Relay Module
Answers from our engineering team on installation, compatibility and integration.
01What safety level does the KFD0-RSH-1.4S.PS2 reach?
Up to SIL 3 acc. to IEC/EN 61508 for the energized-to-safe function on output I and the de-energized-to-safe function on output II.
02What is the input signal?
A non-polarized 24 V logic level, 20 to 26.5 V DC for the 1-signal and -3 to 3 V DC for the 0-signal.
03What contact rating is stated?
253 V AC / 5 A at cos φ 0.7 or 30 V DC / 5 A resistive, with a 2.5 A fuse (max. 5 A).
04Which safety cards are named as compatible?
Yokogawa ProSafe DO cards SDV531 and SDV541 and Honeywell DO card SDO-0824; others on request.
05Is test pulse immunity provided?
Yes, the module tolerates test pulses and offers terminals 10 to 12 for relay checking.
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