Taco SR503-EXP Expandable Circulator Relay are equipped with advanced Features that include being Expandable to 20 Zones including the exclusive Taco PowerPort Plug In Cards. The Taco SR503EXP has such features as post purge priority protection and pump exercise can be added with ease. Any expandable switching relay can also interface with the boiler reset control and injection mixing add on power controls. Mix and match to customize the system.
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Product Spec Sheet
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