Description
- Product Model: KFD2‑SRA‑Ex4
- Brand: Pepperl+Fuchs
- Warranty: One Year
- Input Voltage: 20‑30 VDC system power supply
- Operating Temperature: ‑20 °C to +60 °C
- Storage Temperature: ‑40 °C to +85 °C
- Response Time: ≤ 5 ms relay switching response
- Protection Class: IP20 (DIN‑rail mounted barrier module)
- Accuracy Class: N/A (intrinsically safe relay output barrier)
- Output Frequency: N/A (relay contact output)
- Rated Current Range: 0‑120 mA module consumption; contact rating 2 A / 250 VAC
- Communication Interface: Field‑side intrinsically safe terminals, control‑side DIN‑rail bus terminals
- Supported Protocols: No field bus, galvanic isolated relay switching
- Overload Capacity: Electronic short‑circuit protection on non‑hazardous side; Ex‑ia intrinsic safety certification
- Dimensions: 115 mm × 20 mm × 116 mm
Product Overview
The Pepperl+Fuchs KFD2‑SRA‑Ex4 is a 4‑channel intrinsically safe relay output barrier designed for signal isolation between safe control‑system side and hazardous explosion‑classified field zones. This DIN‑rail mounted module accepts non‑hazardous side control signals and provides four galvanically isolated relay contact outputs for field‑located actuators, solenoid valves and alarm indicators within Ex‑ia hazardous areas. It provides electrical isolation, energy‑limiting intrinsic‑safety protection and relay switching functions within one compact housing. It resolves typical integration pain points such as risk of high‑energy leakage into classified hazardous zones, complex multi‑component isolation layouts, and cross‑circuit interference between control‑system outputs and field devices. Automation engineers, hazardous‑area instrument technicians and process‑plant system integrators benefit from this hardware; four independent channels reduce cabinet space requirement, built‑in intrinsic safety removes extra external energy‑limiting components, and galvanic isolation suppresses ground‑loop noise to maintain reliable actuator control in petrochemical and chemical facilities.
Application Scenarios
- Petrochemical Hazardous‑Zone Solenoid Valve Control: Installed in safe‑area control cabinets. Relay contacts drive solenoid valves for emergency shutdown and purge loops located inside classified Ex‑ia hazardous zones; intrinsic‑safety energy limitation prevents ignition risk from electrical faults.
- Chemical Plant Field Alarm & Indicator Control: Used to switch field‑mounted warning lamps and horn devices within explosive‑risk production areas. Four‑channel design allows multiple discrete field‑output points to be managed by a single barrier module, optimising cabinet layout.
- Legacy DCS System Hazardous‑Area Retrofit & Spare Replacement: Deployed for upgrade projects on existing process‑plant control systems. Standard DIN‑rail footprint enables drop‑in replacement, while intrinsic‑safety certification maintains compliance requirements without redesigning field wiring.
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