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Square D is a market leading brand for NEMA-type industrial controls and automation.

Square D 8501 general purpose relays provide reliable operation for all applications. These relays have industry standard wiring and pin configurations that allow their use as replacement of many similar relays without wiring or hardware modifications. Numerous styles and accessories allow flexible configuration and years of trouble free service.

All of the plug-in relays are UL recognized as well as UL listed when used with the corresponding Square D mating socket.




The Telemecanique Zelio Relay product line encompasses a wide range of products ranging from basic to full-featured relays designed for industrial and general purpose product designs.

Functions in the full-featured version include:

  • Relay state operating indicator
  • Test button
  • Lock-down door
  • Removable labels for customization

The plain-cover version supports budget-restrained applications while maintaining the same ratings and internal components as the full-featured version.

Each product provides a compact size to facilitate integration into installations with simplified mounting on mating sockets.

All Zelio relays are manufactured to conform with the requirements of the RoHS (Restriction of Hazardous Substances) European Directive as well as UL (Underwriters Laboratories) and IEC (International Electrotechnical Commission) standards.