Pepperl+Fuchs
Pepperl+Fuchs KFD2-SR2-Ex1.W – Switch Amplifier
Pepperl+Fuchs KFD2-SR2-Ex1.W – Switch Amplifier
Manufacturer part number: KFD2-SR2-Ex1.W
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ENQUIRE NOWProduct Overview
The Pepperl+Fuchs KFD2-SR2-Ex1.W is a 1-channel isolated barrier switch amplifier for transferring digital signals from hazardous areas to the safe area. It accepts a NAMUR sensor or dry contact on its intrinsically safe input and switches a relay contact output, keeping input, output and supply circuits galvanically isolated with reinforced insulation.
Part of the K-System, the module runs from 24 V DC via the Power Rail or terminals. Line fault detection, a reversible mode of operation selected by DIP switch and suitability up to SIL 2 (SC 3) to IEC/EN 61508 make it well suited to single-point switching duties such as limit switches, level switches and valve position feedback.
Key Features
- Manufacturer: Pepperl+Fuchs
- Model: KFD2-SR2-Ex1.W
- Product type: Switch Amplifier
- 1-channel isolated barrier with relay contact output
- Input for NAMUR sensors or dry contacts
- 24 V DC supply via Power Rail or terminals
- Line fault detection (LFD)
- Reversible mode of operation via DIP switch
- Up to SIL 2 (SC 3) to IEC/EN 61508
- ATEX and IECEx certified [Ex ia] input
Technical Specifications
| Manufacturer | Pepperl+Fuchs |
|---|---|
| Part number | KFD2-SR2-Ex1.W |
| Product type | 1-channel isolated barrier / switch amplifier |
| Signal type | Digital input |
| Rated supply voltage | 19 … 30 V DC (Power Rail or terminals 14+, 15-) |
| Rated current | ≤ 35 mA |
| Power dissipation | ≤ 0.7 W |
| Input | NAMUR to EN 60947-5-6 or dry contact (terminals 1+, 2+, 3-) |
| Switching point / hysteresis | 1.2 … 2.1 mA / approx. 0.2 mA |
| Line fault detection | Breakage I ≤ 0.1 mA, short circuit I > 6 mA |
| Output | 1 × relay (terminals 7, 8, 9) |
| Contact loading | 250 V AC / 2 A / cos φ > 0.75; 40 V DC / 2 A resistive |
| Switching frequency | < 10 Hz |
| Functional safety | SIL 2, SC 3 (IEC/EN 61508) |
| Ambient temperature | -40 … 70 °C |
| Degree of protection | IP20 |
| Dimensions | 20 x 119 x 115 mm (W x H x D), housing type B2 |
| Mass | approx. 150 g |
| Mounting | 35 mm DIN mounting rail (EN 60715) |
| ATEX | PTB 00 ATEX 2080 — II (1)G [Ex ia Ga] IIC, II (1)D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I; TÜV 99 ATEX 1493 X — II 3G Ex ec nC IIC T4 Gc |
| IECEx | IECEx PTB 11.0034, IECEx TUN 19.0013X |
| Other approvals | FM (FM19US0207X), UL/cULus (E106378) |
Specifications are taken from Pepperl+Fuchs manufacturer data. Always confirm critical values — particularly hazardous-area and functional-safety data — against the current datasheet, certificates and instruction manual before installation.
Applications
- Single limit switch or proximity sensor signals from Ex zones
- Valve open/closed position indication
- Level switch alarms to PLC and DCS inputs
- SIL 2 safety loops
Installation and Compatibility
DIN rail mounting with 24 V DC supplied from the Power Rail or terminals 14+/15-. Connect the field device to terminals 1+, 2+, 3- and the relay output to terminals 7, 8, 9. Configure mode of operation and line fault detection with the front DIP switches. Observe the ATEX/IECEx certificate and instruction manual for intrinsically safe loop design.
Frequently Asked Questions
What is the Pepperl+Fuchs KFD2-SR2-Ex1.W?
The Pepperl+Fuchs KFD2-SR2-Ex1.W is a 1-channel isolated barrier switch amplifier for transferring digital signals from hazardous areas to the safe area. It accepts a NAMUR sensor or dry contact on its intrinsically safe input and switches a relay contact output, keeping input, output and supply circuits galvanically isolated with reinforced insulation.
What supply does the KFD2-SR2-Ex1.W need?
19 … 30 V DC (Power Rail or terminals 14+, 15-).
How do I get a price for the KFD2-SR2-Ex1.W?
This product is sold on a price on availability basis. Use the enquiry form on this page with your quantity and application details and the Valves UK team will reply with pricing and lead time.
Technical Documentation
- Pepperl+Fuchs KFD2-SR2-Ex1.W datasheet (PDF)
- KFD2-SR2-Ex1.W on the Pepperl+Fuchs website (certificates, manuals and drawings)
Related Products
- Pepperl+Fuchs KFD2-SR2-Ex2.W – Isolated Barrier Switch Amplifier
- Pepperl+Fuchs KFA5-SR2-Ex1.W – Switch Amplifier (115 V AC)
- View the full Pepperl+Fuchs range at Valves UK
Price and Availability
Price on Availability (POA)
Contact Valves UK for pricing, product availability and technical enquiries regarding the Pepperl+Fuchs KFD2-SR2-Ex1.W. Please include your required quantity and any relevant application details when submitting your enquiry.
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