{"product_id":"rheem-47-21900-01-limit-switch-manual-reset-normally-closed-spst-close-at-31f-opens-at-230f","title":"Rheem 47-21900-01 Limit Switch, Manual Reset, Normally Closed, SPST, Close at -31F, Opens at 230F","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eRheem 47-21900-01\u003c\/strong\u003e is a manual reset limit switch designed for reliable temperature-based circuit protection in HVAC and heating systems. This switch features a \u003cstrong\u003enormally closed (NC) configuration\u003c\/strong\u003e with a \u003cstrong\u003esingle-pole, single-throw (SPST)\u003c\/strong\u003e design, providing straightforward and dependable operation.\u003c\/p\u003e\n\n\u003ch3\u003eTemperature Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOpens At:\u003c\/strong\u003e 230°F — the switch opens the circuit when the temperature reaches 230°F, protecting the system from overheating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCloses At:\u003c\/strong\u003e -31°F — the switch closes the circuit at -31°F\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSwitch Configuration\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Limit Switch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReset Type:\u003c\/strong\u003e Manual Reset — requires manual intervention to restore normal operation after the switch has opened, helping to prevent repeated cycling in fault conditions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDefault State:\u003c\/strong\u003e Normally Closed (NC)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePole Configuration:\u003c\/strong\u003e SPST (Single-Pole, Single-Throw)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThis limit switch is an \u003cstrong\u003eOEM Rheem replacement part\u003c\/strong\u003e (Part Number: \u003cstrong\u003e47-21900-01\u003c\/strong\u003e), ensuring a precise fit and reliable performance for compatible Rheem heating and HVAC equipment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eManual reset design prevents automatic restart after a high-temperature fault\u003c\/li\u003e\n  \u003cli\u003eNormally closed operation ensures the circuit remains active under normal temperature conditions\u003c\/li\u003e\n  \u003cli\u003eOpens at 230°F to protect heating system components from heat damage\u003c\/li\u003e\n  \u003cli\u003eGenuine Rheem OEM part for guaranteed compatibility and quality\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLength:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.0\" \u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWidth:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.0\" \u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeight:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.0\" \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"Rheem","offers":[{"title":"Default Title","offer_id":51514281984306,"sku":"47-21900-01","price":22.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/malachypartsplus.com\/products\/rheem-47-21900-01-limit-switch-manual-reset-normally-closed-spst-close-at-31f-opens-at-230f","provider":"Malachy Parts+","version":"1.0","type":"link"}