Pepperl Fuchs KFD2-STC5-Ex2 Transmitter Power Supply (203645)

P&F KFD2-STC5-Ex2 is a dual-channel SMART transmitter power supply designed for intrinsic safety applications. It supports 2-wire and 3-wire SMART transmitters and current sources, delivering 4–20 mA signals to the safe area in either sink or source mode. With integrated test sockets for HART communicators, 3-way isolation, and SIL 2 compliance, this compact DIN-rail unit is ideal for analog signal processing in Ex-rated zones.

Technical Specifications

• Model: KFD2-STC5-Ex2
• Function: SMART Transmitter Power Supply
• Channels: 2
• Input Signal: 4 … 20 mA
• Output Signal: 4 … 20 mA (sink or source mode)
• Power Supply: 18 … 30 V DC (via Power Rail or terminals)
• Signal Direction: Field to control side
• Mounting: 35 mm DIN rail (EN 60715)
• Connection Type: Screw terminals with integrated test points

Electrical Features

• Isolation: 3-way isolation between input/output/power
• Operating Modes: Current source or sink mode
• Signal Type: Analog (4–20 mA) with HART, BRAIN, Foxboro support
• Ripple: Max. 50 µA rms
• Frequency Range: 0 … 7.5 kHz (Field to control), 0.3 … 7.5 kHz (Reverse)
• Load Resistance: 0 … 600 Ω
• Settling Time: 200 µs
• Rise/Fall Time: 100 µs

Environmental Conditions

• Temperature Range: -20 … 60 °C (up to 70 °C with conditions)
• Protection: IP20
• Weight: Approx. 200 g
• Housing Type: B2 (20 x 124 x 115 mm)
• Approvals: ATEX, IECEx, UL, FM

Hazardous Area Compliance

• Zone Classification: Zone 0, 1, 2 / Div. 1, 2
• 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 ec IIC T4 Gc
• SIL Rating: SIL 2 compliant (SC 3, IEC/EN 61508)

Key Features & Benefits

✅ Dual Channel: Supports two transmitter loops independently.

✅ HART-Ready: Test sockets for direct HART communicator access.

✅ Flexible Output: Works in current sink or source mode.

✅ Integrated Resistor: Enables proper HART communication in low-resistance loops.

✅ SIL 2 Certified: Ideal for use in safety-instrumented systems.

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Perfect for powering and isolating SMART transmitter loops in hazardous areas with high-performance signal transmission and Ex safety.

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