{"product_id":"mcdonnell-miller-120610-fs254-flow-switch-with-nema-4-enclosure","title":"McDonnell \u0026 Miller 120610 FS254 Flow Switch With NEMA 4 Enclosure","description":"\u003cp\u003eMaintain precise liquid flow monitoring in your HVAC and industrial piping systems with the \u003cstrong\u003eMcDonnell \u0026amp; Miller 120610 FS254\u003c\/strong\u003e flow switch. This robust device is engineered to provide dependable make or break circuit action in response to fluid movement, ensuring that equipment such as pumps, chillers, and burners operate only when sufficient flow is present. The \u003cstrong\u003eFS254\u003c\/strong\u003e comes equipped with a NEMA 4 rated enclosure, offering enhanced protection against dust, splashing water, and hose-directed liquid ingress.\u003c\/p\u003e\u003cp\u003eThe flow switch operates via a paddle mechanism inserted into the pipeline, which physically moves in response to the force of the flowing media. This motion triggers the internal switch contacts, allowing for automated system interlocking or alarm signaling based on specific flow conditions. This reliable mechanical actuation ensures immediate feedback for critical system maintenance and safety protocols.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Enclosure:\u003c\/strong\u003e NEMA 4 rating ensures integrity in harsh or moisture-prone environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable Signaling:\u003c\/strong\u003e Precisely triggers circuit transitions based on fluid velocity changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Safety:\u003c\/strong\u003e Prevents dry-running or overheating by locking out equipment during low-flow states.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Operation:\u003c\/strong\u003e Compatible with a wide variety of industrial and commercial hydronic applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Primarily utilized in commercial HVAC piping, industrial water treatment systems, process cooling loops, and high-pressure boiler auxiliary equipment requiring environmental protection.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43124295139422,"sku":"120610","price":308.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/120610_image_0a240bdb-be87-4134-bc22-a759fcf69cfe.png?v=1786034726","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-120610-fs254-flow-switch-with-nema-4-enclosure","provider":"National Boiler Supply","version":"1.0","type":"link"}