{"product_id":"543-190","title":"543-190","description":"This premium 3-inch high limit switch is a vital safety component for residential and commercial heating systems. Designed to monitor the heat exchanger temperature within a furnace or HVAC unit, this thermal cutout switch acts as a critical fail-safe. If the internal temperature reaches a level that could cause damage or pose a safety risk, the switch automatically interrupts the electrical circuit to shut down the heating element or burner. Featuring an L190-40F calibration, it is engineered to trip at 190 degrees Fahrenheit and reset once the temperature has cooled by 40 degrees. Replacing a faulty or tripped limit control is essential for restoring furnace operation and ensuring the long-term reliability of your heating equipment.\u003cbr\u003e\nType: High Limit Control Switch\u003cbr\u003e\nSize: 3-inch probe\u003cbr\u003e\nDimensions: 3 inches (insertion depth)\u003cbr\u003e\nApplication: Used in gas-fired furnaces, electric heating systems, and HVAC air handlers as a primary safety thermal cutout.\u003cbr\u003e\nSpecifications: Opens at 190°F (88°C); Closes at 150°F (66°C); 40°F differential; 3-inch insertion length for accurate temperature sensing within the plenum or heat exchanger.","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ 543-190","offer_id":47250966675741,"sku":null,"price":90.92,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ HH12ZB190","offer_id":47250966708509,"sku":null,"price":90.92,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L190-40F \/ L190-40F.","offer_id":47250966741277,"sku":null,"price":90.92,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/9ec31bde565e47728f861ebbc0ada816.webp?v=1773957077","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-190","provider":"BCFurnace","version":"1.0","type":"link"}