Switching Relays

Switching relays are devices used to control zoning circulator pumps via standard 24V room thermostats. We offer a wide range of universal (compatible with any pump brand) switching relay control modules from Taco, Tekmar and Honeywell in single zone, multi-zone and multi-zone expandable (can be wired together) options.
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Switching Relay, SPST Honeywell-Resideo
Switching Relay, SPST
Part#: RA89A1074 Brand: Honeywell-Resideo
In Stock
(1)
$92.44 / each
$327.80 box of 4 + Free Shipping
($81.95 each)
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1-Zone Switching Relay Taco
1-Zone Switching Relay
Part#: SR501-4 Brand: Taco
In Stock
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(10)
$65.95 / each
$255.80 box of 4 + Free Shipping
($63.95 each)
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301P, 1-Zone Switching Relay Tekmar
301P, 1-Zone Switching Relay
Part#: 301P Brand: Tekmar
In Stock
$66.95 / each
$251.80 box of 4 + Free Shipping
($62.95 each)
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2-Zone Switching Relay w/ Priority Taco
2-Zone Switching Relay w/ Priority
Part#: SR502-4 Brand: Taco
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(17)
$160.95 / each
$623.80 box of 4
($155.95 each)
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302P, 2-Zone Switching Relay w/ Priority, Expandable Tekmar
302P, 2-Zone Switching Relay w/ Priority, Expandable
Part#: 302P Brand: Tekmar
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$147.95 / each
$563.80 box of 4
($140.95 each)
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3-Zone Switching Relay w/ Priority Taco
3-Zone Switching Relay w/ Priority
Part#: SR503-4 Brand: Taco
Temporary Unavailable
(17)
303P, 3-Zone Switching Relay w/ Priority, Expandable Tekmar
303P, 3-Zone Switching Relay w/ Priority, Expandable
Part#: 303P Brand: Tekmar
In Stock
$158.95 / each
$611.80 box of 4
($152.95 each)
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4-Zone Switching Relay w/ Priority Taco
4-Zone Switching Relay w/ Priority
Part#: SR504-4 Brand: Taco
Temporary Unavailable
(17)
4-Zone Switching Relay w/ Priority, Expandable Taco
4-Zone Switching Relay w/ Priority, Expandable
Part#: SR504-EXP-4 Brand: Taco
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(6)
$205.95 / each
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304P, 4-Zone Switching Relay w/ Priority, Expandable Tekmar
304P, 4-Zone Switching Relay w/ Priority, Expandable
Part#: 304P Brand: Tekmar
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$195.95 / each
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6-Zone Switching Relay w/ Priority Taco
6-Zone Switching Relay w/ Priority
Part#: SR506-4 Brand: Taco
In Stock
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(17)
$250.95 / each
$983.80 box of 4
($245.95 each)
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306P, 6-Zone Switching Relay w/ Priority, Expandable Tekmar
306P, 6-Zone Switching Relay w/ Priority, Expandable
Part#: 306P Brand: Tekmar
In Stock
$252.95 / each
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Switching Relay, DPST Honeywell-Resideo
Switching Relay, DPST
Part#: R845A1030 Brand: Honeywell-Resideo
Temporary Out of Stock
$110.44 / each
$387.80 box of 4
($96.95 each)
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Universal Switching Relay, SPST Honeywell
Universal Switching Relay, SPST
Part#: R8845U1003 Brand: Honeywell
In Stock
(1)
$87.72 / each
$315.80 box of 4 + Free Shipping
($78.95 each)
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About Switching Relays

Taco line of switching relays are used in hydronic baseboard/radiator and radiant floor heating applications where zoning with circulators is required. These relays come in 1 through 6-zone models and select (EXP) models can be combined to cover up to 120 zones. SR series switching relays work with virtually any 24V thermostats and are compatible with all major circulator pump brands, including Taco, Grundfos, B&G, Wilo, Armstrong and others.
Taco switching relay allows for simultaneous control of the boiler and circulators via the room thermostat(s). For 1-zone applications, a single thermostat can be wired to control multiple circulators. For 2 or more zones, each thermostat can control a dedicated pump or set of pumps.

Honeywell switching relays available are standard and universal hydronic relays of DPST, SPST or SPDT type. These modules are used for intermittent switching of line or low voltage devices from a line or low-voltage controller with model-specific features.
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