{"product_id":"543-170","title":"543-170","description":"This premium 3-inch high limit switch is a vital safety component designed for residential gas furnaces and HVAC heating systems. Functioning as a thermal cutout, this switch monitors the temperature within the heat exchanger to provide essential overheating protection. When the internal air temperature reaches a critical threshold of 170°F, the switch automatically interrupts power to the heating element or burner, preventing equipment damage and ensuring home safety. This reliable replacement part features an automatic reset with a 40°F differential, meaning it will restore system operation once temperatures have cooled to a safe level. Engineered for durability and precision, this furnace limit control is a common solution for systems experiencing cycling issues or safety shutdowns.\u003cbr\u003e\nType: High Limit Control Switch\u003cbr\u003e\nSize: 3-inch insertion length\u003cbr\u003e\nApplication: Used in forced-air gas furnaces and HVAC heating units as a primary safety sensor to prevent overheating and equipment failure.\u003cbr\u003e\nSpecifications: Temperature Cut-out: 170°F; Temperature Differential: 40°F; Reset Type: Automatic; Mounting Style: Flange mount with 3-inch probe depth.","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L170-40F \/ 543-170","offer_id":47251217580317,"sku":null,"price":80.73,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L170-40F \/ 1NT23L-3643","offer_id":47251217678621,"sku":null,"price":80.73,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L170-40F \/ BA20203","offer_id":49686681485597,"sku":null,"price":80.73,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L170-40F \/ HH12ZB170","offer_id":47251217613085,"sku":null,"price":80.73,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L170-40F \/ L170-40F..","offer_id":47251217645853,"sku":null,"price":80.73,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/543becedc0c24cf59cbfdd53fb68c1d5.webp?v=1773957853","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-170","provider":"BCFurnace","version":"1.0","type":"link"}