{"product_id":"543-210","title":"543-210","description":"The 3-inch High Limit Switch L210-40F is a vital safety component designed for residential forced-air furnaces and heating systems. This thermal limit control serves as a primary safety mechanism, monitoring the air temperature within the heat exchanger to prevent dangerous overheating. If the temperature exceeds the calibrated threshold of 210°F, the switch automatically breaks the electrical circuit to the burner or heating elements, protecting the unit from damage and ensuring home safety. Once the system cools by the designated 40°F differential, the switch automatically resets to restore normal operation. This high-quality replacement part is essential for resolving issues related to furnace short-cycling or thermal cut-out failures caused by restricted airflow or mechanical malfunctions.\u003cbr\u003e\nType: High Limit Control Switch\u003cbr\u003e\nSize: 3-inch insertion depth\u003cbr\u003e\nDimensions: 3 inches\u003cbr\u003e\nApplication: Used in gas and electric forced-air furnaces as a safety limit to monitor heat exchanger temperatures and prevent thermal overload.\u003cbr\u003e\nSpecifications: Open Temperature: 210°F; Close Temperature: 170°F (40°F Differential); Reset Type: Automatic; Configuration: Normally Closed (NC) SPST; Probe Length: 3 inches.","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L210-40F \/ 543-210","offer_id":47250952978717,"sku":null,"price":98.03,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L210-40F \/ 3L09-11","offer_id":47250953077021,"sku":null,"price":98.03,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L210-40F \/ HH12ZB210","offer_id":47250953011485,"sku":null,"price":98.03,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L210-40F \/ L210-40F.","offer_id":47250953044253,"sku":null,"price":98.03,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/11194903ae1943eba66411fd24e6e1e5.webp?v=1773956998","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-210","provider":"BCFurnace","version":"1.0","type":"link"}