• Taco Switching Relay 3 Zone with Priority and 3 Power Ports - SR503-EXP-1

    Product ID • TACSR503EXP0

  • $215.75
  • Normal Ground Shipping


Taco Switching Relay SR503-EXP-1 combines clearly-labeled PC board layouts with advanced features that allow you to completely customize your system. External indicator lights give you instant diagnostic feedback, making service calls or new installation start-ups a snap. The Taco SR503-EXP-1 switching relay is UL listed, use standard replaceable relays and are compatible with conventional and programmable thermostats. For larger jobs, switching relays can be expanded up to 20 zones with priority.

Optional Add-on Power Control Plug:

Boiler Reset Control - PC700

Two Stage Boiler Reset Control - PC702

Variable Speed Pump Injection Mixing Control - PC705

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Manuals & Docs

Technical Specs

Taco Switching Relay 3 Zone for Circulating Pumps Taco SR503-EXP-1 Techs and Specs

  • Zones
    3 with Priority (Priority capability for domestic hot water)
  • Add-on Power Control Plug
  • Add-on PowerPort Card Slots
  • Allows Circulator and Boiler to be switched on at the same time
  • Double Pole
    Single Throw (DPST)
  • Connects directly to thermostat
  • Switches
    110 volts or 24 volts
  • LED Status Lights
  • Maximum Combined Load
    15 amps
  • UL and CSA approved
  • Warranty
    Extended 3 year
  • Manafacrtured Orgin
  • Transformer Voltage
    120 volts
  • Size
    10 1/4 Inches Width by 6 3/4 Inches Height by 2 3/4 Inches Depth

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