Pepperl Fuchs KFD2-SRA-Ex4 Switch Amplifier (190176)

The P&F KFD2-SRA-Ex4 is a 4-channel intrinsically safe switch amplifier that transmits digital signals from NAMUR sensors or dry contacts in hazardous zones to form A normally open relay outputs in safe zones.

With 2:1 wiring reduction technology, this model simplifies installations by cutting field wiring by 50%. It includes line fault detection, DIP switch configuration for output logic, and collective fault messaging via Power Rail integration—ideal for multi-sensor applications in process automation.

Technical Specifications

Model: KFD2-SRA-Ex4
Type: Intrinsically Safe Switch Amplifier
Input Type: NAMUR sensor or dry contact
Output Type: 4 x relay contact outputs
Channels: 4
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. 8 V DC
• Short-Circuit Current: Approx. 8 mA
• Switching Point: 1.2 … 2.1 mA
• Hysteresis: Approx. 0.2 mA
• Line Fault Detection: Break ≤ 0.15 mA, Short ≥ 6 mA
• Pulse/Pause Ratio: Min. 35 ms (non-AC), Min. 70 ms (AC)

Output Specifications

• Output Terminals: I: 7,8 | II: 8,9 | III: 10,11 | IV: 11,12
• Output Type: Relay contact (Form A, normally open)
• Contact Rating:
  • 253 V AC / 2 A (cos φ > 0.7)
  • 40 V DC / 2 A resistive
• Minimum Switching Current: Not specified
• Switching Delay: Approx. 30 ms (On/Off)
• Mechanical Life: 5 × 10⁶ switching cycles

Power & Configuration

• Supply Voltage: 19 … 30 V DC
• Rated Current: 45 … 70 mA
• Power Dissipation: 1.2 W
• Power Rail Support: Yes
• Visual Indicators: LEDs (NAMUR NE 44)
• Configuration: DIP switch configurable (LFD, 2:1 mode, output logic)

Galvanic Isolation

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

• ATEX Marking: II (1)G [Ex ia Ga] IIC / II (1)D [Ex ia Da] IIIC / I (M1) [Ex ia Ma] I
• IECEx Marking: [Ex ia Ga] IIC / [Ex ia Da] IIIC / [Ex ia Ma] I
• Certificates: ZELM 99 ATEX 0009, IECEx TUN 04.0003
• FM/UL Approval: Yes (UL Control Drawing 116-0145)
• Max Safe Voltage (Um): 40 V DC

Key Features & Benefits

✅ 4 Channel Switching: Supports four discrete NAMUR inputs with individual outputs.

✅ 2:1 Wiring Reduction: Cuts field wiring by half using special mode.

✅ Relay Outputs: Form A (NO) relay contacts for safe area load switching.

✅ Collective Error Messaging: Diagnostic feedback via Power Rail integration.

✅ DIN Rail Mount: Compact, efficient design for modern panels.

📦 Buy Pepperl+Fuchs KFD2-SRA-Ex4 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable KFD2-SRA-Ex4 prices.

A versatile 4-channel barrier with integrated diagnostics, wiring savings, and configurable outputs—perfect for dense hazardous area installations.

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

Contact us to place your order today.