Pepperl & Fuchs KFD2-STC4-Ex1 SMART Transmitter Power Supply | Intrinsically Safe

Key Features:

  • Intrinsically safe power supply for 2-wire SMART transmitters

  • Supports analog and HART/SMART digital signals

  • Galvanic isolation between input, output, and power supply

  • Compact DIN-rail mount design

  • Wide application use in hazardous and process industries

  • High reliability and long service life

With its compact DIN-rail design, the KFD2-STC4-Ex1 is simple to install and integrate into existing automation infrastructure. It offers high signal integrity, galvanic isolation, and excellent noise immunity, making it an essential solution for industries such as chemical, pharmaceutical, oil & gas, and process automation. Built to the highest standards, Pepperl & Fuchs ensures both safety and reliability in demanding environments.

Buy Now

Product Specification

Signal type Analog input
Safety Integrity Level (SIL) SIL 2
Connection Power Rail or terminals 14+, 15-
Rated voltage 20 ... 35 V DC
Ripple within the supply tolerance
Power dissipation 1.4 W
Power consumption 1.8 W
Frequency range field side into the control side: bandwidth with 0.5 Vpp signal 0 ... 7.5 kHz (-3 dB) control side into the field side: bandwidth with 0.5 Vpp signal 0.3 ... 7.5 kHz (-3 dB)
Settling time 200 µs
Rise time/fall time 20 µs

Frequently Asked Questions

Industrial Communication & Interface Technology enables data and signal exchange between field devices (like sensors and actuators) and control systems. Pepperl+Fuchs offers a comprehensive range of solutions designed to ensure reliable, efficient, and safe connectivity in industrial environments.

Their technologies are widely used across process automation, manufacturing, chemical plants, oil and gas, water treatment, food and beverage, and pharmaceutical industries — anywhere robust communication and system reliability are essential.

Yes, many of their solutions — including HMIs, Remote I/O, surge protection, and signal conditioners — are certified for use in hazardous areas with ATEX, IECEx, and other global approvals.

AS-Interface (AS-i) is a simple, two-wire network system that connects sensors and actuators to a controller. It reduces wiring complexity, cuts installation time, and allows for cost-effective modular expansion.

Ethernet-APL (Advanced Physical Layer) is a next-gen communication technology that brings high-speed Ethernet to field devices in hazardous areas. It supports longer cable lengths and intrinsic safety, enabling digital transformation at the process level.

Signal conditioners isolate, convert, and amplify analog signals to ensure accurate, interference-free communication between field instruments and control systems. They also help prevent ground loops and electrical noise.

Yes, their HMI and thin client solutions are compatible with virtualised environments like VMware, Citrix, and RDP. These allow for secure, centralised monitoring and control across plant systems.

Remote I/O systems collect I/O signals at the field level and transmit them to the control room over fieldbus or Ethernet networks. This decentralised approach reduces cabling and simplifies system architecture, especially in hazardous zones.


Yes, Pepperl+Fuchs HART interface solutions allow analog and digital data from HART instruments to be integrated into DCS/PLC systems. This enables remote diagnostics and configuration alongside traditional 4–20 mA signals.


They offer surge protection devices for power, data, and signal lines. These protect sensitive equipment from voltage spikes, ensuring uptime and extending equipment life — even in harsh or lightning-prone environments.

IO-Link is a point-to-point communication protocol that allows devices to send rich diagnostic and configuration data to the controller. This supports predictive maintenance, faster setup, and smarter process optimisation.

Yes, products like multiport serial cards and signal conditioners are specifically designed to help integrate older devices with modern automation networks — offering a smooth migration path for system upgrades.

FAQ

Request more information or Advice

Please feel free to request information and advice using the form below or call us on 0151 547 1221

Pepperl & Fuchs KFD2-STC4-Ex1