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2 Zone Switching Relay


Brand: Taco

Qty Price
/ each
$332.55 / box (3 units x $110.85)
In Stock! Ships in 24-48 Hours
(238 Available)



Application: Zoning
Width (Inches): 10-1/4"
Height (Inches): 6.75
Depth (Inches): 2-3/4"

Description for Taco SR502-4

Taco Switching Relays combine clearly-labeled PC board layouts with advanced features that allow you to completely customize your system. And whether you're using basic priority switching, Taco Plug-In PowerPort Cards or add-on power controls, tailoring the system has never been easier. External indicator lights give you instant diagnostic feedback, making service calls or new installation start-ups a snap. All switching relays are UL listed, use standard "ice cube" replaceable relays and are compatible with conventional and programmable thermostats. For larger jobs, switching relays can be expanded up to 20 zones with priority. With the exclusive Taco PowerPort Plug-In Cards, you can easily add such features as post purge, priority protection and pump exercise. Any expandable switching relay can also interface with the Boiler Reset Control and Injection Mixing Add-On Power Controls. Mix-and-match as needed to customize the system.

Features include:

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
Extended 3 Year Warranty
Made in the USA

Note: Images depict SR502-2 Model

2 Zone Switching Relay


by PowerReviews
Taco2 Zone Switching Relay

(based on 1 review)

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Reviewed by 1 customer

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(1 of 1 customers found this review helpful)


Excellent Control

By headstamp

from Carmel, NY

Verified Buyer



      Best Uses

        Comments about 2 Zone Switching Relay:

        Used this relay with priority going to an indirect water heater on a 2 zone system. Works flawlessly and very easy to wire neatly. I like the new cover design, makes for a professional looking installation.

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