The Pepperl+Fuchs KFD0-RSH-1.4S.PS2 is a single-channel, loop-powered signal conditioner with a logic input and a fail-safe relay contact output, designed for safety-critical applications. It offers high reliability with test pulse immunity and supports safety functions up to SIL 3 according to IEC/EN 61508. This module is engineered for de-energized to safe (DTS) and energized to safe (ETS) operations, providing reinforced isolation between its input and output. Typically mounted on a DIN rail, it is suited for industrial automation where robust and safe signal interfacing is required.

• Function: It acts as a signal conditioner and isolating relay module. Its primary purpose is to provide a fail-safe interface between control systems and field devices, enhancing system safety and integrity.
• Power Supply: Loop-powered (20 V DC ... 26.5 V DC for a '1-signal'), meaning it draws its operating power from the input signal loop itself, simplifying wiring.
• Input: Accepts a logic input (20 V DC ... 26.5 V DC, non-polarized). A '0-signal' is recognized at -3 ... 3 V DC, and a '1-signal' at 20 ... 26.5 V DC.
• Output: Features a fail-safe relay contact output (Form C or similar, depending on mode).

• Safety Rating: Certified for applications up to Safety Integrity Level (SIL) 3 according to IEC/EN 61508. This makes it suitable for highly critical safety functions.

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