SR503-4 | 3 Zone Switching Relay | Taco

Taco SR503-4 3-Zone Switching Relay with PriorityThe Taco SR503-4 is a 3-Zone Switching Relay with Priority designed for controlling multiple zones in hydronic heating or cooling systems. It offers a convenient and efficient way to prioritize and manage the operation of different zones based on user-defined settings. The SR503-4 features: Priority Control: Allows users to set a priority for each zone, ensuring that critical zones receive heating or cooling first. 3 Independent Zones: Controls up to three separate zones, providing flexibility in system design. Switch Type: Employs a reliable relay-based switching mechanism for precise control of zone valves. Compact Size: Designed with a compact and DIN-mountable form factor, saving valuable space in control panels. Versatile Applications: Suitable for use in residential, commercial, and industrial hydronic systems, providing a comprehensive solution for heating and cooling control.
The Taco SR503-4 Switching Relay is the best choice for all your zoning needs, with advanced PowerPort Cards, external diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.

• 24-Volt power input or output terminal
• Fuse protected
• Simplified wiring
• Compact design