• Taco Switching Relay - SR504-EXP-4

    - 4 Zones - With Priority and 3 Power Ports - for Circulating Pumps

    Product ID • TACSR504EXP0

  • $222.75
  • Quantity:
  • Free Ground Shipping


Taco Switching Relay SR504-EXP-4 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 SR504-EXP-4 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

Return Policy | Shipping Policy

Manuals & Docs

Technical Specs

Taco Switching Relay 4 Zone for Circulating Pumps Taco SR504-EXP-4 Techs and Specs

  • Zones
    4 Zones 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

Info & Links