6-Zone Switching Relay w/ Priority


Brand: Taco

Mfr Part#: SR506-4

UPC#: 687752388992

Availability: Out Of Stock
Usually ships: Upon availability
Qty Price
$205.95 / each & Free Shipping
x2 $391.90 & Free Shipping
(2 x $195.95 / each)
  • Description
  • Literature
  • Reviews (2)
  • FAQs

Taco SR506 Switching Relay combines clearly labeled PC board layout with advanced features that allowfor total system customization. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. Taco SR506 switching relay is UL and CSA listed, uses standard “ice cube” replaceable relay and is 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.

Technical Specifications:

  • Zones: 6;
  • Power: 120VAC;
  • Max combined load: 20.0 AMPs;
  • Dimensions: 11.75" wide x 7.50" high x 3.0" deep.


Extended 3 Year Warranty.
6-Zone Switching Relay w/ Priority has an average 4.5 out of 5 rating based on 2 user reviews.
Working Great, has lights where I can see them at a glance
By Joe Homeowner (from Way up North in Minnesota) on 12/2/2015
Replacement for a older model. Works as advertised and is easy to install.
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Time and space saver
By Lance Strawser Contracted Services (from Perkasie, Pennsylvania) on 11/16/2013
I purchased this unit and it arrived in less then 24 hrs., and I'm a few states away. This unit saved me time and a lot of aggravation. It is so simple to wire your connection and the price was the best, no matter where I looked. If you have multiple zone and a boiler that requires a circulator to drive that boiler, you need to purchase this switch relay.
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