SR501-4 - 1 Zone Switching Relay w/Fused Outputs

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SKU: SR501-4
Regular price $83.22

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Taco SR501-4 - 1 Zone Switching Relay w/Fused Outputs

Taco's Enhanced Switching Relays are 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. The Enhanced Switching Relays additional features include built-in priority protection, premium sealed relays, compact design, fuse protected, isolated end switch and universal thermostat compatibility.


  • Front Diagnostic Lights
  • Simplified Wiring
  • Switchable Priority (Switching Relay)
  • Built-in Priority Protection (Switching Relay)
  • Premium Sealed Relays
  • Compact Design
  • Fuse Protected (with spare)
  • 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


  • Hot Water Heating Systems
  • Closed Cooling Circuits
  • Air Conditioning Systems
  • Hydronic Heating & Cooling
  • Water/Glycol concentrations up to 50%
  • Solar / Geothermal