Pepperl+Fuchs KFD0-RO-2 2-Channel Relay Module

Technical Overview

2-channel signal conditioner with SIL 3 functional safety, 15-30V DC input, 230V AC/4A or 30V DC/4A relay output, IP20, and galvanic isolation.

Key Features

2-channel signal conditioner
24 V DC supply (loop powered)
Logic input 15 V DC to 30 V DC, non-polarized
Relay contact output
Up to SIL 3 functional safety according to IEC/EN 61508
Reinforced galvanic isolation between input and output
LED indicators for relay output status
DIN rail mounting (35 mm EN 60715)
Fast response times: 10 ms energize / 5 ms de-energize

Technical Specification Matrix

Parameter	Value
Signal Type	Digital Output
Safety Integrity Level (SIL)	SIL 3 (acc. to IEC/EN 61508)
Rated Voltage (Supply)	15 ... 30 V DC, loop powered
Power Dissipation	0.8 W
Input Voltage	15 ... 30 V DC
Input Current	≤ 21 mA per channel
Output Contact Loading	230 V AC / 4 A / cos φ > 0.7; 30 V DC / 4 A resistive load
Energized/De-energized delay	approx. 10 ms / approx. 5 ms
Mechanical Life	5 x 10^6 switching cycles
Electrical Life	10^5 switching cycles (at maximum load)
Switching Frequency	< 10 Hz
Galvanic Isolation	Input/Output reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Ambient Temperature	-20 ... 65 °C (-4 ... 149 °F)
Degree of Protection	IP20
Mounting	35 mm DIN mounting rail acc. to EN 60715:2001
Physical Weight (kg)	0.1
Dimensions L x W x H (cm)	11.5 x 2 x 11.9

Industrial Applications

1. Emergency Shutdown System (ESD) in Chemical Plants

The KFD0-RO-2 can be integrated into critical Emergency Shutdown Systems in chemical processing plants to reliably de-energize actuators or trigger alarms. Its SIL 3 rating and galvanic isolation ensure high safety integrity for process interruptions.

Problem Solved

Provides a highly reliable, safety-rated interface for critical shutdown sequences, preventing catastrophic failures and ensuring operational safety in hazardous chemical environments by isolating control signals and ensuring rapid response.

SIL 3Galvanic IsolationRelay OutputEmergency ShutdownProcess Safety15-30V DC Input

2. Safe Actuation of Valves in Oil & Gas Pipelines

This module is suitable for controlling safety-instrumented valves (e.g., emergency block valves) in oil and gas pipelines. It offers isolated switching based on control system commands, protecting the control system from field-side electrical disturbances.

Problem Solved

Ensures safe and isolated control of critical field devices like valves in volatile oil and gas operations. Its SIL 3 compliance and robust relay outputs prevent uncontrolled flows or pressures, enhancing system reliability.

SIL 3Relay Contact OutputGalvanic IsolationPipeline ControlHazardous Area (implied)Process Control

3. Interfacing Fire Alarm Systems with Building Management

The KFD0-RO-2 can serve as a dependable interface between a fire alarm control panel and other Building Management Systems (BMS) to activate critical safety measures such as smoke dampers or ventilation system shutdowns. Its galvanic isolation prevents electrical interference between disparate systems.

Problem Solved

Offers a highly reliable and galvanically isolated digital output for building safety components, ensuring quick (10ms energize delay) and dependable responses during fire emergencies, while mitigating risks of electrical noise impacting system integrity.

Digital OutputSIL 3Galvanic IsolationFast ResponseBuilding AutomationFire Safety