Taco SR501-2 1 Zone Switching Circulator Relay

Original price was: $101.89.Current price is: $79.63.

27 in stock

SKU: 228799 Category:



  • Automates Circulator Pump Operation: Manages the activation and deactivation of a circulator pump in a hydronic heating or cooling system, ensuring efficient water circulation only when needed.
  • Single Zone Control: Designed to manage a single zone, meaning it can control one circulator pump and its associated heating or cooling loop.

Key Features:

  • Dry Contact Relay: Activates the pump using dry contacts, compatible with various control signals (e.g., thermostats, zone valves).
  • External Priority Protection: Prevents simultaneous operation of multiple circulators, protecting against excessive electrical load.
  • Compact Design: Occupies minimal space, making it suitable for tight installations.
  • Easy Installation: Straightforward to install and wire, typically using screw terminals.
  • LED Indicator: Provides visual confirmation of relay operation and pump status.

Common Applications:

  • Hot Water Recirculation: Activates circulators to ensure immediate hot water availability at fixtures.
  • Hydronic Heating Systems: Controls pumps for zoned heating systems, circulating hot water to specific areas as needed.
  • Chilled Water Systems: Manages pumps for cooling loops, providing efficient cooling distribution.

Additional Information:

  • Voltage: 120 volts AC
  • Maximum Load: 4 amps
  • Enclosure Rating: NEMA 1 (indoor use only)
  • Available Upgrades: SR502-4 model for multi-zone control (up to 4 zones)

Installation and Use:

  • Consult Manuals and Diagrams: Always refer to Taco’s installation instructions and wiring diagrams for proper setup and wiring.
  • Professional Assistance: If you’re not comfortable with electrical work, consult a qualified electrician for safe and correct installation.

Additional information

Weight 2.37 lbs


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