{"product_id":"543-003","title":"543-003","description":"This premium 3-inch high limit switch is a critical safety component designed for forced-air heating systems and residential furnaces. Functioning as a thermal cutout, this switch monitors the internal temperature of the heat exchanger or plenum. If the system exceeds a safe operating temperature, the switch automatically breaks the electrical circuit to prevent overheating and potential damage to the appliance. Once the temperature cools to a safe level, the internal bimetal disc resets, allowing the system to resume normal operation. Essential for DIY furnace repair and HVAC maintenance, this high-limit control ensures your heating equipment operates within manufacturer safety parameters, protecting your home from fire hazards and mechanical failure caused by restricted airflow or component malfunction.\u003cbr\u003e\nType: High Limit Safety Switch\u003cbr\u003e\nSize: 3-inch insertion depth\u003cbr\u003e\nDimensions: 3 in\u003cbr\u003e\nApplication: Commonly used in gas and electric furnaces, air handlers, and forced-air heating systems to monitor plenum temperature and provide high-heat protection.\u003cbr\u003e\nSpecifications: Standard 220-degree Fahrenheit cutout (L220) with a 30-degree Fahrenheit differential (30F) for automatic reset.","brand":"BCFurnace","offers":[{"title":"3\" HIGH LIMIT SWITCH L220-30F \/ 543-003","offer_id":47251247268125,"sku":null,"price":110.05,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L220-30F \/ 1NT23L-2179","offer_id":47251247366429,"sku":null,"price":110.05,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L220-30F \/ C340366P04","offer_id":47251247399197,"sku":null,"price":110.05,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L220-30F \/ L220-30F.","offer_id":47251247333661,"sku":null,"price":110.05,"currency_code":"CAD","in_stock":true},{"title":"3\" HIGH LIMIT SWITCH L220-30F \/ SWT01614","offer_id":47251247300893,"sku":null,"price":110.05,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/95a8e3042a6e46118c6b07b85cca201a.webp?v=1773957910","url":"https:\/\/bcfurnace.myshopify.com\/products\/543-003","provider":"BCFurnace","version":"1.0","type":"link"}