Pepperl+Fuchs KFD2-STC5-1 SMART Transmitter Power Supply | Replacement, Equivalent & Selection Guide
The Pepperl+Fuchs KFD2-STC5-1 is a DIN-rail mounted, loop-powered SMART Transmitter Power Supply designed for intrinsically safe signal conditioning in hazardous-area process automation. It converts and isolates 4–20 mA HART signals between field instruments and control systems, ensuring reliable data transmission in Zone 0/1/2 and Division 1/2 environments.
Technical Specifications
| Parameter | Value |
|---|---|
| Model / SKU | KFD2-STC5-1 |
| Manufacturer | Pepperl+Fuchs |
| Series | KFD2 (SMART) |
| Function | SMART Transmitter Power Supply / Signal Conditioner |
| Input Signal | 4–20 mA, HART |
| Output Signal | 4–20 mA, HART |
| Supply Voltage | 20–35 V DC (loop-powered) |
| Isolation | Galvanic, 3-way |
| Hazardous Area Approval | ATEX, IECEx, FM, CSA |
| Protection Class | Ex ia IIC / Zone 0, 1, 2 |
| Mounting | DIN rail (35 mm) |
| Housing Width | 12.5 mm (single-width) |
| Operating Temperature | -20 °C to +60 °C |
| Weight | approx. 200 g |
| Certifications | ATEX II 1 G, IECEx, UL, cUL |
Compatible Replacement & Equivalent Models
The following models are functionally equivalent or drop-in replacements for the KFD2-STC5-1. Always verify electrical parameters and approvals before substitution:
| Model | Brand | Notes |
|---|---|---|
| KFD2-STC5-1.2O | Pepperl+Fuchs | Variant with 2-output; same series |
| KFD2-STC5-Ex1 | Pepperl+Fuchs | Extended Ex approval variant |
| KFD0-STC5-1 | Pepperl+Fuchs | Non-isolated predecessor; verify loop requirements |
| MTL4541 | MTL Instruments | Functional equivalent; HART-compatible isolator |
| MTL4541S | MTL Instruments | With status output; check wiring diagram |
| P+F KFD2-STC5-1.20 | Pepperl+Fuchs | 20 mA output variant |
| R2.188.0030.0 | Stahl | Cross-reference; confirm approval class |
| 9160/01-01-01 | Turck | Functional equivalent; verify HART pass-through |
Note: Cross-references are provided for selection guidance only. Konmask.com recommends verifying all specifications against your system requirements before ordering.
Why Choose the Original KFD2-STC5-1
- Genuine Pepperl+Fuchs quality — manufactured to IEC 60079 and EN 50020 standards
- Full HART transparency — bidirectional HART communication preserved end-to-end
- 3-way galvanic isolation — eliminates ground loops and protects control system inputs
- Compact 12.5 mm housing — maximizes DIN-rail density in marshalling cabinets
- Wide approval portfolio — ATEX, IECEx, FM, CSA for global project compliance
- Long-term availability — active product with full Pepperl+Fuchs lifecycle support
Typical Applications
- Oil & gas upstream/downstream process control
- Chemical and petrochemical plant instrumentation
- Pharmaceutical manufacturing (FDA-compliant environments)
- Power generation and utilities
- Water and wastewater treatment facilities
- Mining and minerals processing
- HART-enabled DCS/PLC marshalling panels
System Compatibility
The KFD2-STC5-1 is compatible with the following control systems and field devices:
- DCS: Emerson DeltaV, Honeywell Experion, ABB 800xA, Yokogawa CENTUM VP
- PLC: Siemens S7-300/400/1500, Rockwell ControlLogix, Schneider Modicon
- Field Transmitters: Rosemount 3051, Endress+Hauser Cerabar, Yokogawa EJA series
- HART Multiplexers: Pepperl+Fuchs HiDMux2700, Emerson 375/475 Field Communicator
Selection Guide
Use the table below to select the correct KFD2-STC5 variant for your application:
| Requirement | Recommended Model |
|---|---|
| Standard 1-channel, HART pass-through | KFD2-STC5-1 ✓ |
| Dual output to two control inputs | KFD2-STC5-1.2O |
| Extended temperature range | KFD2-STC5-Ex1 |
| Non-isolated, cost-sensitive application | KFD0-STC5-1 |
| NAMUR NE43 fault signaling required | KFD2-STC5-1 (built-in) |
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels
- Each unit inspected for physical integrity, label authenticity, and date code
- Functional testing available on request (4–20 mA loop verification)
- Certificate of conformity and original manufacturer documentation provided
- Traceability records maintained for industrial and EPC project requirements
How to Order
- Confirm your model number: KFD2-STC5-1
- Specify quantity and required delivery timeline
- Contact us for volume pricing, lead time, and export documentation
- Add to cart or email support@konmask.com for a formal quotation
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Replacement & Compatibility FAQ
Can I replace KFD2-STC5-1 with MTL4541?
Yes, in most applications. Both are 4–20 mA HART isolators with similar I/O. Verify supply voltage range, terminal layout, and Ex approval class before substitution. Wiring diagrams differ.
Is KFD2-STC5-1 compatible with HART 7?
Yes. The KFD2-STC5-1 is HART-transparent and supports HART 5, 6, and 7 protocols without configuration changes.
What is the difference between KFD2-STC5-1 and KFD0-STC5-1?
The KFD2 series provides 3-way galvanic isolation; the KFD0 series does not. For applications requiring ground loop elimination or where the control system input is not isolated, the KFD2 is required.
Can this unit be used in Zone 0?
Yes, with appropriate field-side wiring and certified Zener barriers or associated apparatus. The KFD2-STC5-1 is certified Ex ia IIC, suitable for Zone 0 field instruments.
Do you provide documentation for EPC projects?
Yes. We can provide manufacturer datasheets, EU Declaration of Conformity, ATEX certificates, and test reports upon request.
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