{"product_id":"taco-sr503-three-zone-pump-switching-relay-with-priority-replaces-ar861-3","title":"Taco SR503 Three Zone Pump Switching Relay with Priority (Replaces AR861-3)","description":"\u003cspan style=\"font-size: 12pt;\"\u003e\u003cspan style=\" font-weight: bold;\"\u003eProduct Downloads and Manuals:\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size: 12pt;\"\u003e\u003cspan style=\"\"\u003eTaco SR503 Three Zone Pump Switching Relay with Priority (Replaces AR861-3)\u003c\/span\u003e\u003c\/span\u003e\u003cbr style=\"\"\u003e\u003cp style=\"\"\u003e\u003cspan style=\"font-size: 12pt;\"\u003eTaco Switching Relays combine clearly-labeled PC board layouts with advanced features that allow you to completely customize your system. Whether youre 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.\u003cbr\u003e \u003cbr\u003e 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.\u003cbr\u003e Mix-and-match as needed to customize the system. \u003cbr\u003e \u003cbr\u003e \u003cb\u003eFeatures include:\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cul style=\"\"\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size: 12pt;\"\u003eExternal Indicator Lights\u003cbr\u003e \u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eSwitchable Priority\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eSimplified Wiring\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eFully Enclosed Snap-Out Relays\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eCompact Design\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eFuse Protected\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003e100% Factory Tested\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eIsolated End Switch\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eContractor Friendly PC Board Layout\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eUniversal Thermostat Compatibility\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eUL and CSA Approved\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003e24 Volt Power Input or Output Terminal\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eExtended 3 Year Warranty\u003cbr\u003e \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 12pt;\"\u003eMade in the USA \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cspan style=\"font-size: 12pt;\"\u003e\u003cbr style=\"\"\u003e \u003c\/span\u003e","brand":"Taco","offers":[{"title":"Default Title","offer_id":47344059056301,"sku":"21738","price":173.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/5895\/3645\/files\/sr5032.jpg?v=1787901829","url":"https:\/\/www.bostonheatingsupply.com\/products\/taco-sr503-three-zone-pump-switching-relay-with-priority-replaces-ar861-3","provider":"Boston Heating Supply","version":"1.0","type":"link"}