Configured for discrete sensor signal conditioning and hazardous-area switching execution in industrial control instrumentation, the Pepperl+Fuchs KFU8-SR-EX1.W (KFU8-SR-EX1.W Switch Amplifier) provides direct physical/electrical execution across automation networks.

Model Designation and Suffix Structure

The full model code encodes the KFU8 wide housing profile, the SR functional grouping designating switch amplifier operation for proximity sensors and mechanical contacts, the Ex1 single-channel hazardous-area intrinsic safety rating, and the .W suffix representing the wide-range universal AC/DC power supply variant.

Hardware Specifications

Intrinsic Safety Barriers and Surge Voltage Protection Limits

Engineered for Pepperl+Fuchs K-System infrastructure, this isolator integrates certified intrinsic safety (Ex i) barriers to restrict electrical energy transfer into explosive atmospheres. Internal surge voltage protection limits safeguard sensitive switching circuits against transient voltage spikes and high-frequency interference. Galvanic isolation between field sensors, control outputs, and the universal power supply prevents ground loops and protects downstream logic controllers from hazardous potential shifts.

Ordering Information and Package Contents

• 1 x Pepperl+Fuchs KFU8-SR-EX1.W Switch Amplifier unit
• 1 x Removable pluggable terminal block set (screw type)
• 1 x Technical documentation and safety compliance leaflet

Field Installation Guidelines and Wiring Practices

• Mount the housing securely onto a standard 35 mm DIN rail within a protective control cabinet enclosure.
• Route intrinsically safe field wiring through designated conduits, maintaining strict physical separation from safe-area power cables.
• Connect the universal power supply wires to the designated AC or DC input terminals, verifying voltage compatibility.
• Wire relay load outputs through the changeover contacts, ensuring external fusing complies with the 2 A maximum rating.
• Torque terminal screws securely to ensure low-resistance electrical contact and prevent conductor loosening under vibration.

Frequently Asked Questions

• Q: What is the primary operational function of the KFU8-SR-EX1.W?

  A: It provides galvanic isolation and signal amplification for NAMUR sensors or mechanical contacts located in hazardous areas.

• Q: What types of input field devices are supported by this switch amplifier?

  A: The unit accepts NAMUR proximity sensors in accordance with EN 60947-5-6 and dry mechanical switch contacts.

• Q: What power supply voltage range does the .W suffix accommodate?

  A: It supports a wide-range universal power supply covering 90 to 253 VAC as well as 20 to 300 VDC.

• Q: What type of output switching mechanism is integrated into the unit?

  A: It features an electromechanical relay output with a single-pole double-throw (SPDT) changeover contact configuration.

• Q: What is the maximum switching rating of the output relay contacts?

  A: The relay contacts support up to 250 VAC, 2 A, and 100 VA under resistive load conditions.

• Q: How is the module mounted inside an industrial control panel?

  A: It snaps directly onto a standard 35 mm DIN rail complying with EN 60715 installation specifications.

• Q: What is the internal power dissipation of the switch amplifier?

  A: Internal power consumption remains below or equal to 2.0 W under normal operating conditions.

• Q: Can this unit be hot-swapped while the control system is energized?

  A: Hot-plugging depends on plant safety policies, but power and field wiring terminals must be de-energized during maintenance.