{"product_id":"543-009","title":"543-009","description":"This 3-inch high limit switch is a vital safety component engineered for forced-air gas furnaces and HVAC heating systems. Acting as a thermal protection device, this switch monitors the temperature of the heat exchanger to prevent dangerous overheating conditions. If the air temperature reaches the safety threshold, the switch automatically opens to interrupt the heating cycle, protecting both the appliance and the home. This replacement part is designed for durability and precision, ensuring your furnace operates within safe thermal parameters. It is an essential component for DIY furnace repair and professional HVAC maintenance, helping to restore reliable and safe operation to your heating equipment.\u003cbr\u003e\nType: High Limit Safety Control Switch\u003cbr\u003e\nSize: 3-inch insertion depth\u003cbr\u003e\nDimensions: 3 inches (insertion probe)\u003cbr\u003e\nApplication: Used in residential gas furnaces, forced-air heating units, and HVAC systems to monitor heat exchanger temperatures and provide high-temperature cutout protection.\u003cbr\u003e\nSpecifications: Temperature Limit: 170°F (Open); Temperature Differential: 20°F (Resets at 150°F); Circuit: Single Pole Single Throw (SPST); Reset Type: Automatic.","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L170-20F \/ 543-009","offer_id":47251385811229,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L170-20F \/ 47-25349-02","offer_id":47251385843997,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L170-20F \/ 6613081","offer_id":47251385909533,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L170-20F \/ L170-20","offer_id":47251385876765,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/4700b97068134fe8bc5701de95764d66.webp?v=1773958464","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-009","provider":"BCFurnace","version":"1.0","type":"link"}