Catalogue reference. Availability, exact specification and OEM or aftermarket supply are confirmed in your quotation.
KFD2-STC4-EX2 — SMART Transmitter Power Supply / 2-Channel Isolated Barrier
Sensors & automationPart number: KFD2-STC4-EX2
The Pepperl+Fuchs KFD2-STC4-Ex2 is a two-channel isolated barrier for powering two-wire SMART transmitters in hazardous areas and transferring their analog signals to the safe area. It accepts a 20–35 V DC supply, transfers 0/4–20 mA signals and supports bidirectional digital communication. Terminal test points accommodate HART communicators.
Looking for Pepperl+Fuchs KFD2-STC4-EX2? This catalogue reference is listed under Sensors & automation. Send the part number and your equipment details so we can confirm the specification, availability and a quotation including shipping.
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Technical specifications
| Manufacturer | Pepperl+Fuchs |
|---|---|
| Part number | KFD2-STC4-EX2 |
| Category | Sensors & automation |
| Item Type Name | SMART Transmitter Power Supply / 2-Channel Isolated Barrier |
| Product Family / Series | K-System |
| Model Number | KFD2-STC4-Ex2 |
| Part Number Alternate | 283699 |
| number_of_channels | 2 |
| signal_type | Analog input |
| input_signal | 0/4–20 mA |
| output_signal | 0/4–20 mA |
| supply_voltage | 20–35 V DC |
| power_dissipation | 1.8 W |
| power_consumption | Maximum 2.7 W |
| available_voltage_at_input | At least 16 V at 20 mA at terminals 1+ and 3− |
| sil_rating | SIL 2 according to IEC/EN 61508 |
| hazardous_area_installation | Zone 2 / Division 2 |
| input_circuit | EEx ia IIC |
| supported_protocols | HART, BRAIN, Foxboro |
| operating_temperature | −20 to 60 °C |
| mounting | 35 mm DIN rail per EN 60715:2001 |
| Features | Screw terminals with test points; LED indicator |
| Isolation | Functional insulation between outputs and between output and power supply |
| Weight | Approximately 150 g |
| Dimensions | 20 × 124 × 115 mm (W × H × D) |
| Reference status | Published catalogue reference; confirm specification and fitment before ordering |
| Availability | On request |
| Output load | 0–550 Ω at 20 mA |
Catalogue information may contain errors or be out of date. Full specifications and verified details are available on request. Confirm the part number and equipment fitment with us before ordering.
Product questions
What does the KFD2-STC4-Ex2 do?
It is a two-channel isolated barrier that powers two-wire SMART transmitters in a hazardous area and transfers their analog signals to the safe area as isolated current signals.
Does the KFD2-STC4-Ex2 support HART communication?
Yes. It transfers superimposed digital signals bidirectionally and has terminal test sockets for HART communicators. A built-in 250 ohm resistor between terminals 8 and 9 can be used if loop communication resistance is too low.
What supply voltage and signal range does this barrier use?
The rated supply is 20–35 V DC, connected through the Power Rail or terminals 14+ and 15−. The input and output ranges are 0/4–20 mA, and the specified output load is 0–550 ohms at 20 mA.
Will this barrier work with my existing transmitter and installation?
It is intended for two-wire SMART transmitters. Confirm the transmitter model and serial number, loop voltage and load, hazardous-area classification, and applicable installation documentation before selecting it. Interchangeability with another barrier cannot be assumed.
How much voltage is available to the field transmitter?
The manufacturer specifies at least 16 V at 20 mA at field terminals 1+ and 3−. Check the transmitter voltage requirement and cable voltage drop when assessing the loop.
Researched on:
Research information may be outdated. Confirm fitment and specifications with our team before ordering.