{"product_id":"rcd-hh12zb220-limit-switch-3-125-inches-l220-40f","title":"Rcd hh12zb220 Limit Switch 3.125 Inches L220-40F","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe RCD hh12zb220 is a high-limit safety switch used in gas furnaces and forced-air heating systems to prevent overheating. When supply air temperatures exceed the rated threshold, the limit switch opens the control circuit and shuts down the burner, protecting the heat exchanger from thermal damage. Measuring 3.125 inches in length and rated at the L220-40F specification, this switch is a direct-replacement component installed by licensed HVAC technicians during routine maintenance and equipment repair.\u003c\/p\u003e\n\u003cp\u003eThis limit switch is suited for residential gas furnace applications where OEM-style replacement parts are required. It is commonly installed in forced-air furnace systems as part of the high-limit control circuit. The L220-40F designation indicates the trip and reset temperature characteristics, which technicians use to confirm correct fitment for the application. Compatible Carrier parts and accessories applications are noted in the product identification.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh-limit safety function opens control circuit on over-temperature condition\u003c\/li\u003e\n  \u003cli\u003eL220-40F rating for defined trip and reset temperature points\u003c\/li\u003e\n  \u003cli\u003e3.125-inch body length for standard furnace mounting locations\u003c\/li\u003e\n  \u003cli\u003eOEM-style replacement designed for Carrier HVAC heating systems\u003c\/li\u003e\n  \u003cli\u003eProtects heat exchanger from thermal stress during blower or airflow failures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eIdentified as a Carrier parts and accessories replacement component for Carrier HVAC central air and switch parts applications. Designed as an OEM-style replacement for residential gas furnace high-limit control circuits.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eA licensed HVAC technician should install this limit switch. Shut off power to the furnace at the disconnect and set the thermostat to the off position before beginning any work. Limit switches are typically mounted to the furnace plenum or heat exchanger compartment and connected into the low-voltage control circuit. Do not bypass or jumper a limit switch to restore furnace operation, as this removes the primary overheat protection from the system.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 3.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Rating\u003c\/strong\u003e: L220-40F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: RCD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: hh12zb220\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RCD","offers":[{"title":"Default Title","offer_id":51233522549042,"sku":"HH12ZB220","price":26.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/307625982.jpg?v=1780102156","url":"https:\/\/voomisupply.com\/products\/rcd-hh12zb220-limit-switch-3-125-inches-l220-40f","provider":"Voomi Supply","version":"1.0","type":"link"}