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Taco Enhanced Zone Pump Switching Relay

Completely customize your system.

The Taco Pump Switching Relay is the best choice for all your zoning needs, with advanced timer and boiler functions, 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 integration is achieved.

  • Front Diagnostic Lights
  • Switchable Priority
  • Built-in Priority Protection
  • Simplified Wiring
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected
  • 100% Factory Tested
  • Isolated End Switch
  • Contractor Friendly PC Board Layout
  • Universal Thermostat Compatibility
  • 24 Volt Power Output for hard wired thermostats
  • Field Replaceable Transformer
  • UL Approved
  • Extended 3 Year Warranty
  • Made in the USA
Electronic parts are not returnable. Please check to make sure you have chosen the correct part.

Single Zone Switching Relay

Part No: SR501-4

$90.68 each

Two Zone Switching Relay w/Priority

Part No: SR502-4

$196.42 each

Three Zone Switching Relay w/Priority

Part No: SR503-4

$209.51 each

Four Zone Switching Relay w/Priority

Part No: SR504-4

$252.26 each
↓EXP Models w/ PowerPorts ↓

Three Zone Switching Relay w/Priority & 3 PowerPorts

Part No: SR503-EXP-4

$252.29 each

Four Zone Switching Relay w/Priority & 3 PowerPorts

Part No: SR504-EXP-4

$245.84 each

Six Zone Switching Relay w/Priority & 3 PowerPorts

Part No: SR506-EXP-4

$302.17 each


Toll Free: (866) 361-4782

Fax: 206-274-1501

17420 Vashon Hwy SW
PO Box 2270
Vashon, WA 98070

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