CALEFFI Z-One Relay ZSR104

Features Overview for Caleffi ZSR104 The Caleffi ZSR104 is a multi-zone switching relay operated by low voltage thermostats or controllers. Controlling up to four zone pumps and a primary pump, the ZSR104 is a convenient solution for pump control in multi-zone hydronic heating systems. The ZSR104's installer friendly design saves time and money while its durable build ensures proper operation for years to come. Installer Friendly The Caleffi ZSR104 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 ZSR104 is an incredibly versatile unit in a small package. Universal Compatibility The ZSR104 features configurable pump logic along with the ability to connect to 2, 3 and 4 wire zone valves and thermostats. Additional Features Primary pump output Three dry contacts for enab