Key Technical Features
| Feature | Description | 
| Power Supply | 24 V DC (Power Rail), rated 20 ~ 35 V DC, power consumption about 1.5 ~ 1.9 W | 
| Channels | Single‑channel (1 Channel) | 
| Input/Output | Both input and output are 0/4 ~ 20 mA current loops, supporting loads up to 0 ~ 800 Ω | 
| Intrinsic Safety Level | SIL 2 (IEC 61508 compliant); can reach SIL 3 in redundant configurations | 
| Frequency Response | Up to 7.5 kHz (‑3 dB) | 
| Isolation & Protection | Electrically isolated output; internal 250 Ω (or 274 Ω) resistor can serve as HART communication impedance | 
| Communication Protocols | Supports HART (digital overlay); some versions are compatible with BRAIN, Foxboro | 
| Mounting | DIN 35 mm rail‑mountable, equipped with standard terminal block (1+, 2‑, 3, 5‑, 6+, 7‑, 8+, 9) | 
| Environmental Ratings | Operating temperature –20 ~ +60 °C, protection class IP20, compliant with EN 61326‑1, NE 21, etc. | 
| Safety Functions | Energy‑limiting Zener barrier + electrical isolation to prevent ignition in hazardous zones, simplifying Ex‑i circuit maintenance | 
Typical Applications
- Process control in hazardous zones: Provides safe power to 2‑wire/3‑wire SMART transmitters (e.g., pressure, temperature, flow) and isolates the analog signal for transmission to a safe area.
- Intrinsic safety system integration: Can be combined with P+F’s safety barrier families (K, H series) as well as Power Rail, UPR‑03, KFD2‑EB2, etc., to create large‑scale safe‑signal networks.
- HART communication: When loop impedance is insufficient, the built‑in 250 Ω (or 274 Ω) resistor can raise HART communication impedance, ensuring reliable digital overlay.
Main Advantages
- High safety rating: SIL 2 certified; redundancy can elevate it to SIL 3, meeting stringent intrinsic‑safety requirements.
- Comprehensive isolation: Energy‑limiting barrier plus electrical isolation guarantees strict energy restriction between hazardous and safe zones.
- Flexible wiring and compatibility: Standard DIN rail mounting and a rich terminal layout support a wide range of SMART transmitters and communication protocols.
- Broad frequency response: 7.5 kHz bandwidth accommodates high‑speed process signals.
In short, the KFD2‑STC4‑Ex1 is a highly reliable, internationally‑standard‑compliant isolated power barrier for industrial automation, process control, and intrinsic‑safety systems, capable of safely and accurately powering and transmitting analog/digital signals in hazardous environments.
 
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