Pepperl+Fuchs KFD2-SR2-Ex1.W | 1-Channel Switch Amplifier, SIL 2,

Pepperl+Fuchs KFD2-SR2-Ex1.W | Intrinsically Safe Relay Output Barrier for NAMUR Sensors – SIL 2

Overview

The KFD2-SR2-Ex1.W is a 1-channel isolated barrier switch amplifier from Pepperl+Fuchs, engineered for safe and reliable transmission of digital signals from hazardous areas to control systems in the safe zone. Accepting inputs from NAMUR sensors or dry contacts, this unit delivers a relay contact output and supports SIL 2 compliance per IEC 61508 standards.

With built-in line fault detection (LFD) and reversible operation, it’s ideal for safety-critical environments and process automation systems that require precise monitoring and diagnostics.

Key Features

• NAMUR Sensor & Dry Contact Input – Supports sensors or switches in hazardous areas

• Relay Output – Form C (changeover contact) with high switching capacity

• Line Fault Detection (LFD) – Monitors for open and short circuits

• SIL 2 Certified – Safety Integrity Level 2, IEC 61508 / IEC 61511 compliant

• Power Supply Options – 24 V DC via Power Rail or terminal

• Status Indicators – LEDs for relay status, power, and fault diagnostics

• Reversible Output Logic – Configurable via DIP switch for Light/Dark operation

Technical Specifications

• Input Type: NAMUR sensor or dry contact

• Open Circuit Voltage: Approx. 8 V DC

• Short-Circuit Current: Approx. 8 mA

• Switching Thresholds: ON > 2.1 mA / OFF < 1.2 mA

• Output Type: Relay, SPDT (form C), contact rating:

  • 253 V AC / 2 A (cos φ > 0.7)

  • 40 V DC / 2 A (resistive load)

• Minimum Switch Current: 2 mA @ 24 V DC

• Response Time: Approx. 20 ms

• Supply Voltage: 19–30 V DC

• Power Consumption: ≤ 0.9 W

• Mounting Type: DIN Rail (EN 60715)

• Operating Temperature: -20 °C to +60 °C

• Enclosure Rating: IP20

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

• Indicators: Green (power), Yellow (relay), Red (LFD)

Applications

• Process Control Systems – Interfaces field devices in hazardous areas with PLCs and DCS

• Chemical & Oil Industry – Used in ATEX and intrinsically safe loop installations

• SIL 2 Safety Loops – Ideal for ESD (Emergency Shutdown) signal routing

• Automation Panels – Reliable relay output from hazardous zone signals

Why Choose the KFD2-SR2-Ex1.W?

• Reliable signal isolation and transfer from hazardous areas

• Includes diagnostics and status indicators for quick troubleshooting

• SIL 2 certified for safety-critical applications

• Flexible configuration with DIP switch setup

• Compact 20 mm width saves panel space

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Fast shipping and worldwide delivery available.

NEW product in original sealed packaging. The product may be of older version or design. The packaging may have markings, signs of discoloration, and wear. DDPARTSSOLUTION Warranty: 1 Year. Manufacturer's Warranty and Support NEVER apply