Zelio Logic Parts

Zelio Logic smart relays sit between hardwired relay panels and full PLCs: an SR2 or SR3 unit provides a fixed set of inputs and relay or transistor outputs, a small display and a function-block programming model simple enough to be configured on the device itself. They are widely used for lighting sequences, pump alternation, simple machine interlocks and similar tasks where a PLC would be oversized.

The SR2- and SR3-prefixed references indexed here include the smart relays themselves, expansion modules and accessories. Matching rules are straightforward but unforgiving: supply voltage, output type and display/clock options are all encoded in the reference, so a visually identical unit may differ from the installed one in a way that matters on site.

Product pages carry the electrical characteristics recovered from the original documentation together with sourcing notes. Zelio Logic remains an active Schneider line in its current generations, but older references have been superseded, and the pages flag where a successor reference provides a compatible drop-in.

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