Pepperl+Fuchs KFD2-ST3-Ex2 | 2-Channel Switch Amplifier | Dry Contact or NAMUR Inputs

Pepperl+Fuchs KFD2-ST3-Ex2 | Reliable Switch Amplifier for Intrinsic Safety Applications

Overview

The KFD2-ST3-Ex2 is a 2-channel isolated barrier from Pepperl+Fuchs, designed to transfer digital signals (NAMUR sensors or dry contacts) from hazardous areas to control systems in safe areas. Each input controls an active transistor output. The device offers galvanic isolation between input, output, and power supply, ensuring signal integrity and safety. It features line fault detection (LFD) and a reversible mode of operation, making it versatile for various applications. The device is SIL 2 certified according to IEC/EN 61508, ensuring high reliability in safety-critical applications.

Key Features

• Signal Type: Digital Input

• Input: Dry contact or NAMUR sensors

• Output: Active transistor

• Channels: 2

• Power Supply: 19–30 V DC via Power Rail or terminals 14+, 15-

• Line Fault Detection (LFD): Detects lead breakage and short-circuit

• Reversible Mode of Operation: Configurable via DIP switches

• Safety Certification: SIL 2 (IEC/EN 61508)

• Mounting: 35 mm DIN rail (EN 60715)

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

• Protection Class: IP20

• Ambient Temperature Range: -20 °C to +60 °C

• Weight: Approximately 150 g

• Part Number: 262111

Technical Specifications

• Input Terminals: 1+, 2+, 3-; 4+, 5+, 6-

• Output Terminals: Output I: terminal 7+; Output II: terminal 9+

• Open Circuit Voltage/Short-Circuit Current: Approx. 10 V DC / approx. 8 mA

• Switching Point/Switching Hysteresis: 1.2–2.1 mA / approx. 0.2 mA

• Line Fault Detection:

  • Breakage: I ≤ 0.1 mA

  • Short-Circuit: I ≥ 6.5 mA

• Response Time: ≤200 µs

• Switching Frequency: ≤5 kHz

• Rated Voltage (Output): 30 V DC

• Rated Current (Output): 100 mA

• Signal Level:

  • 1-Signal: (Supply voltage) - 3 V max. for 100 mA

  • 0-Signal: Blocked output (off-state current ≤10 µA)

• Galvanic Isolation:

  • Input/Output: Reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V_eff

  • Input/Power Supply: Reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V_eff

• Indicators: LEDs for power supply, output status, and line fault

• Control Elements: DIP switches for configuration

• Labeling Space: Available at the front for easy identification

Approvals and Certifications

• ATEX: II 3(1)G Ex nA [ia Ga] IIC T4 Gc; II (1)D [Ex ia Da] IIIC; I (M1) [Ex ia Ma] I

• IECEx: Ex nA [ia Ga] IIC T4 Gc; [Ex ia Da] IIIC; [Ex ia Ma] I

• UL: cULus Listed (E106378)

• CE: EN 61326-1:2013 (industrial locations)

• UKCA: Certified

Applications

• Process Automation Systems

• Chemical and Petrochemical Industries

• Oil and Gas Facilities

• Pharmaceutical Manufacturing

• Water and Wastewater Treatment Plants

Why Choose Pepperl+Fuchs KFD2-ST3-Ex2?

• Intrinsic Safety: Suitable for use in hazardous areas with appropriate certifications

• High Accuracy: Ensures precise signal transmission with minimal deviation

• Galvanic Isolation: Protects control systems from field-side faults

• Compact Design: Slim housing saves space in control cabinets

• Easy Configuration: DIP switches allow for straightforward setup and mode selection

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