CALEFFI Z-ONE Relay ZSR103

Caleffi Z-One™ - Zone Switching Relay - Three Zones - Expandable Model: ZSR103 Item Number: 102879 Overview for Caleffi ZSR103 The Caleffi ZSR103 is a multi-zone switching relay operated by low voltage thermostats or controllers. Controlling up to three zone pumps and a primary pump, the ZSR103 is a convenient solution for pump control in multi-zone hydronic heating systems. The ZSR103's installer friendly design saves time and money while its durable build ensures proper operation for years to come. Installer Friendly The Caleffi ZSR103 features ample room for terminations, large screw terminals, an automatic resettable fuse and snap-in transformers to make installation a breeze. Versatile With three selectable 120 VAC auxiliary switches, dedicated pump outputs and unlimited zone expansion, the ZSR103 is an incredibly versatile unit in a small package. Universal Compatibility The ZSR103 features configurable pump logic along with the ability to connect to 2, 3 and 4 wire