{"product_id":"543-001","title":"543-001","description":"Ensure the safety and efficiency of your heating system with this premium 3-inch high limit switch. Designed as a critical thermal safety component for HVAC units, furnaces, and air handlers, this L140-40F control switch monitors internal temperatures to prevent dangerous overheating. If temperatures exceed the preset safety threshold of 140°F, the switch automatically interrupts the electrical circuit to shut down the heating element or burner. Once the unit cools down by 40°F, the system safely resets. This high-quality replacement part is essential for maintaining proper airflow safety and protecting your appliance from heat damage. It is an ideal solution for professional technicians and DIY homeowners looking for reliable climate control components that ensure long-term system health.\u003cbr\u003e\nType: High Limit Control Switch\u003cbr\u003e\nSize: 3-inch sensing probe\u003cbr\u003e\nDimensions: 3 inches\u003cbr\u003e\nApplication: Used in HVAC systems, central furnaces, and air handling units as a thermal safety cutout to prevent overheating.\u003cbr\u003e\nSpecifications: Temperature Limit: Opens at 140°F; Differential: 40°F (Closes at 100°F); Reset Type: Automatic; Configuration: Normally Closed (NC).","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L140-40F \/ 543-001","offer_id":47251349537053,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L140-40F \/ 1NT23L-5128","offer_id":47251349635357,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L140-40F \/ HH12ZB140","offer_id":47251349569821,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L140-40F \/ L140-40F..","offer_id":47251349602589,"sku":null,"price":68.83,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/3080af97269e4512a7f27f0c6808fc97.webp?v=1773958329","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-001","provider":"BCFurnace","version":"1.0","type":"link"}