{"product_id":"120-638","title":"120-638","description":"This premium HVAC high limit switch is a critical safety component designed to monitor and regulate internal temperatures within furnace and air handling units. Engineered as a fan disc control, this switch prevents system overheating by automatically breaking the electrical circuit when temperatures reach the 140°F limit and resetting once the system cools to 100°F. Featuring a Single Pole Single Throw (SPST) configuration, this auto-reset switch ensures reliable operation and protects your heating equipment from thermal damage. It is an essential replacement part for restoring proper furnace cycles and ensuring safe, consistent airflow in residential and light commercial heating systems.\u003cbr\u003e\nType: High Limit Control Switch\u003cbr\u003e\nSize: Small\u003cbr\u003e\nApplication: Used in HVAC systems, forced-air furnaces, and air handlers to provide over-temperature protection and fan cycle control.\u003cbr\u003e\nSpecifications: Temperature Rating: Opens at 140°F, Closes at 100°F (L140-100); Circuitry: Single Pole Single Throw (SPST); Reset Type: Automatic; Switch Type: Normally Closed (O\/C)","brand":"BCFurnace","offers":[{"title":"YORK\/ETC LIMIT SWITCH L140 100F(O\/C),SPST,AUTORESET \/ 120-638","offer_id":50216916287773,"sku":null,"price":47.95,"currency_code":"CAD","in_stock":true},{"title":"YORK\/ETC LIMIT SWITCH L140 100F(O\/C),SPST,AUTORESET \/ S1-02526392007","offer_id":50216916320541,"sku":null,"price":47.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/0b02fd294e5d498685fce78c0e9f2259.webp?v=1773960449","url":"https:\/\/bcfurnace.myshopify.com\/products\/120-638","provider":"BCFurnace","version":"1.0","type":"link"}