KFD2-STC4-1 Pepperl+Fuchs SMART Transmitter Power Supply

Product Overview

The Pepperl+Fuchs KFD2-STC4-1 functions as a high-performance 1-channel signal isolator and power source for SMART transmitters. This module energizes 2-wire and 3-wire field devices while accurately transferring 0/4–20 mA analog signals to the control system. Designed for high-integrity industrial loops, it supports bidirectional HART digital communication, allowing engineers to extract diagnostic data and configure field instruments remotely. It serves as a critical interface in process automation, ensuring signal purity and electrical separation between field instrumentation and the PLC/DCS.

Technical Specifications

The KFD2-STC4-1 utilizes advanced circuitry to maintain signal accuracy in demanding environments:

• Number of Channels: 1-channel

• Input Compatibility: 2-wire/3-wire SMART transmitters; 2-wire SMART current sources

• Output Range: 0/4 mA to 20 mA

• Digital Communication: Bidirectional HART protocol support

• Safety Rating: SIL 2 (compliant with IEC/EN 61508)

• Power Supply: 24 V DC via Power Rail or terminals

• Power Dissipation: 1.4 W

• Insulation Voltage: 50 V AC (functional)

• Connection Type: Screw terminals with integrated test points

• Mounting: 35 mm DIN rail (EN 60715)

• Dimensions: 20 mm x 119 mm x 115 mm (W x H x D)

• Weight: 200 g

Engineering Advantages

• HART Transparency: The KFD2-STC4-1 allows HART signals to pass through the isolation barrier without attenuation. This enables seamless use of handheld communicators or Asset Management Systems (AMS) to monitor device health.

• Functional Safety Compliance: With a SIL 2 rating, this module integrates directly into Safety Instrumented Systems (SIS). It provides the calculated reliability data required for risk reduction in hazardous processes.

• Efficient Power Management: The module draws power directly from the Pepperl+Fuchs Power Rail system. This eliminates point-to-point daisy-chain wiring, reduces cabinet clutter, and simplifies hardware hot-swapping.

• Maintenance-Friendly Design: Integrated test points allow technicians to measure current loops without disconnecting wires. This minimizes process downtime and prevents accidental loop breaks during routine calibration checks.

• Small Footprint: The 20 mm slim housing maximizes rail space, allowing for higher I/O density in crowded control rooms and field junction boxes.

FAQs

Q1: Does the KFD2-STC4-1 support 3-wire transmitters?A1: Yes. The module provides the necessary terminals to power and receive signals from both 2-wire (loop-powered) and 3-wire SMART transmitters.

Q2: Can I use this module in a SIL 3 safety loop?A2: While the KFD2-STC4-1 is rated for SIL 2, you may achieve SIL 3 levels through redundant architectural configurations (such as 1oo2) depending on your specific safety manual calculations.

Q3: Is this product original Pepperl+Fuchs?A3: We supply only 100% Brand New and Original Pepperl+Fuchs hardware. Each unit ships in factory packaging and includes the manufacturer's standard quality assurance documentation.

Q4: How does the "Power Rail" feature work?A4: The Power Rail is an insert for the DIN rail that provides power and collective error messaging. The KFD2-STC4-1 snaps onto the rail and draws its 24 V DC supply instantly, significantly reducing wiring time for large-scale installations.