{"product_id":"543-037","title":"543-037","description":"This 3-inch high limit switch is a vital safety component for residential gas furnaces and HVAC systems. Designed to monitor the internal temperature of the heat exchanger, this limit control acts as a safeguard against overheating. If the furnace reaches a temperature of 190°F, the switch automatically opens the electrical circuit to the gas valve, halting the heating process to prevent equipment damage and ensure home safety. Once the system cools down by 40°F, the switch automatically resets to allow for normal operation. Replacing a faulty high limit switch is essential for maintaining reliable performance and preventing frequent furnace cycling or total system lockout.\u003cbr\u003e\nType: HVAC High Limit Control Switch\u003cbr\u003e\nSize: 3-inch\u003cbr\u003e\nDimensions: 3 inches\u003cbr\u003e\nApplication: Used in high-efficiency gas furnaces and central heating units to provide thermal overload protection and system safety monitoring.\u003cbr\u003e\nSpecifications: Open Temperature: 190°F; Close\/Reset Differential: 40°F (Resets at 150°F); Circuit Configuration: Normally Closed (NC); Reset Type: Automatic.","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ 543-037","offer_id":47251748487453,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ 1186801","offer_id":47251748552989,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ HH12ZZ190","offer_id":47251748618525,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ INT23L 7350","offer_id":50745464291613,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ INT23L-7350","offer_id":50745463898397,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ INT23L7350","offer_id":50745463505181,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ L190-40","offer_id":47251748749597,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ L190F-40","offer_id":47251748684061,"sku":null,"price":98.4,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/765e2920057b45409647ce8ce423bec7.webp?v=1773959277","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-037","provider":"BCFurnace","version":"1.0","type":"link"}