3-Zone Switching Relay w/ Priority
Brand: Taco
Part#: SR503-4
In Stock
Usually ships: within 1 business days
Taco SR503 Switching Relay combines clearly labeled PC board layout with advanced features that allow for total system customization. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. Taco SR503 switching relays are UL and CSA listed, use standard “ice cube” replaceable relays and are compatible with conventional and programmable thermostats.
  • External Indicator Lights
  • Switchable Priority
  • Simplified Wiring
  • Fully Enclosed Snap-Out Relays
  • Compact Design
  • Fuse Protected
  • 100% Factory Tested
  • Isolated End Switch
  • Contractor Friendly PC Board Layout
  • Universal Thermostat Compatibility
  • UL and CSA Approved
  • 24 Volt Power Input or Output Terminal
  • Made in the USA
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Technical Specifications:
  • Zones: 3
  • Power: 120VAC
  • Max combined load: 15.0 AMPs
  • Dimensions: 10.25" wide x 6.75" high x 2.75" deep.
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Extended 3 Year Warranty;
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Verified Purchase
Taco relay
It's the right product for my application. One relay for multiple zones, works and looks good.
By Jack (from Minnesota) on 03/31/2015
Helpful? Yes No
One complaint
The SR503-4 3 zone switch appears to be a quality unit. No operational issues so far (
By Gary P. (from Barre, MA) on 02/27/2013

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