{"product_id":"543-018","title":"543-018","description":"This 3-inch High Limit Switch is a critical safety component designed for modern HVAC systems and forced-air furnaces. Its primary function is to monitor the internal temperature of the heat exchanger or plenum, automatically cutting power to the heating source if temperatures exceed a safe operating threshold. Featuring a precision L190-30F thermal profile, the switch is engineered to open the circuit at 190 degrees Fahrenheit and reset once the temperature drops by 30 degrees. Replacing a malfunctioning or tripped high limit control is essential for preventing system overheating, protecting the heat exchanger from damage, and ensuring the safety of your home heating system. This durable, snap-action thermal sensor is a standard requirement for maintaining proper airflow and temperature regulation in residential and commercial heating units.\u003cbr\u003e\nType: HVAC High Limit Control Switch\u003cbr\u003e\nSize: 3-inch insertion depth\u003cbr\u003e\nDimensions: 3 in\u003cbr\u003e\nApplication: Forced-air furnaces, central heating systems, and HVAC air handlers designed to prevent system overheating.\u003cbr\u003e\nSpecifications: Opening Temperature: 190°F; Temperature Differential: 30°F; Switch Type: Normally Closed (NC); Reset Type: Automatic.","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L190-30F \/ 543-018","offer_id":47251272499485,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-30F \/ 1NT23L-2177","offer_id":47251272597789,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-30F \/ C340366P02","offer_id":47251272565021,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-30F \/ L190-30F.","offer_id":47251272663325,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-30F \/ SWT01612","offer_id":47251272532253,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-30F \/ SWT1612","offer_id":47251272630557,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/2a2cbfb5b27f4fc3acf868534505496a.webp?v=1773958050","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-018","provider":"BCFurnace","version":"1.0","type":"link"}