6-Zone Switching Relay w/ Priority, Expandable


Brand: Taco

Mfr Part#: SR506-EXP-4

UPC#: 687752198935

Availability: In Stock
Usually ships: within 1 business day
Qty Price
$214.95 / each & Free Shipping
x2 $407.90 & Free Shipping
(2 x $203.95 / each)
  • Description
  • Literature
  • Reviews
  • FAQs (2)

Taco SR506-EXP is a 6-Zone Expandable Switching Relay. Combines clearly labeled PC board layout with advanced features that allow for total system customization. Taco expandable switching relays allow to expand up to 20 zones, while built-in PowerPort slots allow to utilize the advanced features of the PowerPort Cards and Add-on Power Controls. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups. Taco SR506-EXP expandable 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;
  • (3) Plug-in PowerPort Card Slots;
  • Add-on Power Control Plug;
  • Expandable to 20 Zones;
  • Interface with Expandable (-EXP) Taco Zone Valve Controls;
  • 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 3.00" deep.


Extended 3 Year Warranty;
No reviews yet
Indicate an email address where you wish to receive the answer to your question.
Enter numbers shown above without spaces. This step helps us to prevent automatic submissions.
is this switch used for zoning with circulators, or can it be used for zone valves as well?
Read 1 answer
Taco SR series switching relays are for zoning with circulators only. If you need a zone valve control, see Taco ZVC series (http://www.pexuniverse.com/taco-zone-valve-controls)
Answered on 6/20/2016 by PexUniverse Customer Service
Was this answer helpful?  Yes / No
What are the external lights general purpuse
Read 1 answer
0 of 1 people found this answer helpful.
External LED lights indicate current operating status of the system and allow to diagnose and troubleshoot any issues should they arise.
Answered on 12/5/2012 by PexUniverse Customer Service
Was this answer helpful?  Yes / No

Similar products

The following was added to your shopping cart: ×

Forgot Your Password?

Enter your e-mail address below.
You will receive an e-mail
with password reset instructions.


Estimate Delivery Date & Cost

Ship to Zip Code:
Qty (Optional):