Pepperl Fuchs KFD2-ST3-Ex2 Switch Amplifier (262111)

The P&F KFD2-ST3-Ex2 is a 2-channel intrinsically safe switch amplifier designed for transferring digital signals from NAMUR sensors or dry contacts in hazardous areas to active transistor outputs in safe zones.

Featuring configurable logic reversal, line fault detection, and rapid switching, this SIL 2 rated unit offers dependable signal transmission and diagnostics in demanding process automation environments.

Technical Specifications

Model: KFD2-ST3-Ex2
Type: Intrinsically Safe Switch Amplifier
Input Type: NAMUR sensor or dry contact
Output Type: Active transistor output
Channels: 2
Mounting: 35 mm DIN rail (EN 60715)

Input Specifications

• Connection Terminals: 1+, 2+, 3-; 4+, 5+, 6-
• Standard: EN 60947-5-6 (NAMUR)
• Open Circuit Voltage: Approx. 10 V DC
• Short-Circuit Current: Approx. 8 mA
• Switching Point: 1.2 … 2.1 mA
• Hysteresis: Approx. 0.2 mA
• Line Fault Detection: Break ≤ 0.1 mA, Short ≥ 6.5 mA
• Pulse/Pause Ratio: Min. 100 µs

Output Specifications

• Output Terminals: I: 7+ | II: 9+
• Output Type: Active transistor
• Rated Voltage: 30 V DC
• Rated Current: 100 mA
• Response Time: ≤ 200 µs
• Signal Levels:
  • 1-Signal: Supply voltage – 3 V max @ 100 mA
  • 0-Signal: Off-state current ≤ 10 µA
• Switching Frequency: ≤ 5 kHz

Power & Configuration

• Supply Voltage: 19 … 30 V DC
• Rated Current: 15 … 20 mA + I_out
• Power Dissipation: ≤ 900 mW
• Power Rail Support: Yes
• Visual Indicators: LEDs (NAMUR NE 44)
• Configuration: DIP switch configurable

Galvanic Isolation

• Input/Output: Reinforced (300 Veff)
• Input/Power Supply: Reinforced (300 Veff)

Environmental & Mechanical

• Operating Temperature: -20 … 60 °C
• Degree of Protection: IP20
• Connection: Screw terminals
• Dimensions: 20 x 119 x 115 mm (W x H x D)
• Weight: Approx. 150 g

Certifications & Safety

• SIL Rating: SIL 2 (SC 3) per IEC/EN 61508
• ATEX Marking: 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 Marking: Ex nA [ia Ga] IIC T4 Gc / [Ex ia Da] IIIC / [Ex ia Ma] I
• Certificates: EXA 16 ATEX 0016 X, IECEx EXA 16.0009X
• Max Safe Voltage (Um): 253 V AC

Key Features & Benefits

✅ Dual Channel Isolation: Separately configurable outputs for NAMUR inputs.

✅ Active Transistor Outputs: Directly interface to PLCs or control systems.

✅ SIL 2 Certified: Compliant with IEC/EN 61508 for safety systems.

✅ High-Speed Performance: Switching frequency up to 5 kHz with 200 µs response.

✅ Power Rail Integration: Enables collective fault messaging and simplified wiring.

📦 Buy Pepperl+Fuchs KFD2-ST3-Ex2 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable KFD2-ST3-Ex2 prices.

Perfect for reliable dual-channel signal isolation with fast response and integrated diagnostics for critical Ex applications.

In stock now and available with 2–3 days delivery.

Contact us to place your order today.