Description
Pepperl+Fuchs KCD2-SR-EX2
Technical Specifications
Signal type: Digital input
Channels: 2
Supply connection: Power Rail or terminals 9+, 10-
Rated supply voltage: 19 to 30 V DC
Supply ripple: ≤ 10 %
Rated current: ≤ 46 mA
Power dissipation: ≤ 900 mW
Input connection: Terminals 1+, 2- and 3+, 4-
Input standard: EN 60947-5-6 NAMUR
Open-circuit voltage: approximately 8 V DC
Short-circuit current: approximately 8 mA
Switching point: 1.2 to 2.1 mA
Switching hysteresis: approximately 0.2 mA
Line fault detection: breakage ≤ 0.1 mA, short-circuit ≥ 6.5 mA
Pulse/pause ratio: minimum 20 ms / minimum 20 ms
Output type: 2 relay outputs
Output terminals: 5, 6 and 7, 8
Contact load: 250 V AC / 2 A / cos φ > 0.75; 126.5 V AC / 4 A / cos φ > 0.75; 30 V DC / 2 A resistive load
Minimum switching current: 2 mA / 24 V DC
Switching frequency: ≤ 10 Hz
Switch-on delay: ≤ 20 ms
Switch-off delay: ≤ 20 ms
Mechanical life: 10⁷ switching cycles
SIL rating: SIL 2
Systematic capability: SC 3
Insulation: reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Hazardous area isolation: up to 375 V peak according to IEC/EN 60079-11
Ambient temperature: -40 to 70 °C
Protection class: IP20
Connection type: screw terminals
Dimensions: 12.5 × 119 × 114 mm
Weight: approximately 100 g
Mounting: 35 mm DIN rail according to EN 60715
Functional Features
2-channel isolated barrier for NAMUR or dry contact inputs
Relay contact outputs for direct PLC/DCS interfacing
Line fault detection for open circuit and short circuit
DIP switch configuration for operating mode and fault behavior
LED status indication
Power Rail or terminal block power supply
Three-way galvanic isolation between input, output, and supply
SIL 2 capability for safety-related applications
Compact 12.5 mm housing width
Suitable for Zone 2 installation on the safe-area side
Application Scenarios
Hazardous area proximity switch monitoring
Valve position feedback in petrochemical plants
Flow switch and level switch signal isolation
Rotating speed or pulse counting from NAMUR sensors
Safety-related shutdown circuits up to SIL 2
Process automation systems requiring intrinsic safety barriers
Oil and gas, chemical, pharmaceutical, and marine installations
Performance Parameters
Input compliance: NAMUR EN 60947-5-6
Switching threshold: 1.2 to 2.1 mA
Hysteresis: approximately 0.2 mA
Response delay: ≤ 20 ms
Release delay: ≤ 20 ms
Maximum switching frequency: 10 Hz
Relay contact rating: 250 V AC / 2 A
Isolation voltage: 300 Veff functional isolation; 375 V peak hazardous area isolation
SIL: 2
Supply range: 19 to 30 V DC
Power loss: ≤ 900 mW
Material Composition
Thermoplastic industrial housing
PCB with relay output stages
NAMUR input conditioning circuits
Line fault detection circuitry
DIP switch configuration block
LED indicators
Screw terminal blocks
Power Rail contact system
Galvanic isolation barriers
Metal DIN rail mounting clip
Internal fuse and protection components
Structural Features
K-System slim-line 12.5 mm housing
Front-facing screw terminals for field and control wiring
DIP switches for mode and fault configuration
LED indicators for power and channel status
Labeling area on front face
Power Rail compatible rear contacts
IP20 protected enclosure
DIN rail clip for quick mounting
Compact depth suitable for control cabinet panels
Working Principle
The module supplies a limited-energy NAMUR excitation voltage to field devices located in the hazardous area. Current changes from the NAMUR sensor or dry contact are detected on the field side, evaluated against the switching threshold, and converted into relay output states on the control side. Line fault detection monitors the field loop for open circuits and short circuits. Galvanic isolation prevents hazardous energy transfer between the field circuit, power supply, and relay outputs. Configuration is performed via DIP switches, and status is indicated by LEDs.
