{"product_id":"060b017291-differential-pressure-switch-with-thermal-time-relay","title":"060B017291 Differential Pressure Switch with Thermal Time Relay","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e060B017291 (060B017291)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a high-precision differential pressure switch specifically engineered for the protection of refrigeration compressors and large-scale industrial machinery against low lubricating oil pressure. Serving as the official direct replacement for the legacy\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e060B017266\u003c\/strong\u003e, this unit integrates a critical thermal time relay that prevents \"nuisance tripping\" during the initial start-up phase or momentary pressure fluctuations. In critical sectors such as power generation, marine propulsion, and large-scale HVAC, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e060B017291\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emonitors the differential between the oil pump discharge pressure and the crankcase pressure. By ensuring that a safe oil pressure is maintained after a predetermined time delay, it acts as a primary safety guard against catastrophic mechanical failure and costly equipment downtime.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration\u003c\/h3\u003e\n\u003cp\u003eThe hardware architecture of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e060B017291\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis centered around a robust bellows system designed for maximum durability, capable of withstanding test pressures up to 22 bar (319 psig). The unit comes with a factory-set differential of 0.65 bar (9 psig), providing an optimized balance between safety and operational stability. The defining feature of this model is the integrated thermal time relay; this component introduces a necessary delay before the switch activates the safety circuit, allowing the oil pump to build sufficient pressure during start-up. The enclosure is rated IP20, suitable for installation within protected control cabinets or machinery housings. Designed for high-temperature resilience, the bellows can handle temperatures up to 100 deg C, while the ambient operating environment should be maintained at or below 60 deg C.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eFeature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e060B017291\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDANFOSS\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDifferential Pressure Switch (MP Series)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFactory Setting\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.65 bar (9 psig)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax. Test Pressure (Pe)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e22 bar (319 psig)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBellows Max Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100 deg C \/ 212 deg F\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMax. Ambient Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e60 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eControl Element\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eThermal Time Relay\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEnclosure Rating\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIP20\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eLegacy Replacement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e060B017266\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.0 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use the 060B017291 to replace my old 060B017266 unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 060B017291 is the officially designated replacement for the 060B017266. It maintains the same form factor and technical parameters, ensuring a seamless drop-in installation without requiring modification to your existing piping or electrical logic.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the function of the thermal time relay in this switch?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe thermal time relay acts as a safety delay. When the compressor starts, the oil pressure is initially zero. The relay allows the system to run for a specific duration (the \"time delay\") to reach operating pressure. If the pressure fails to rise above the 0.65 bar setpoint before the relay times out, the switch trips the safety circuit to stop the machine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it possible to adjust the 0.65 bar factory setting?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhile the unit is factory-calibrated to 0.65 bar for standard compressor protection, minor adjustments may be possible depending on the specific application requirements. However, for most industrial oil lubrication systems, the 0.65 bar setpoint is the industry standard for optimal protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the bellows temperature rating higher than the ambient rating?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe bellows are in direct contact with the process medium (e.g., hot lubricating oil), which can reach significantly higher temperatures than the surrounding air. The 100 deg C rating ensures the physical sensor element does not degrade when monitoring hot oil circuits.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePulsation Dampening:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eWhen connecting the pressure switch to high-speed reciprocating compressors, it is recommended to use capillary tubes or pulsation dampers. This minimizes the mechanical vibration and pressure pulses reaching the bellows, preventing premature wear and ensuring the thermal relay operates based on stable average pressure values.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eElectrical Wiring and Reset Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe safety circuit should be wired so that once the thermal relay trips, the compressor cannot restart automatically. Manual intervention should be required to reset the switch after investigating the cause of the low oil pressure. Ensure the supply voltage to the thermal relay matches the technical requirements to prevent coil burnout.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMounting and Orientation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTo ensure the longevity of the IP20 enclosure and internal components, mount the unit in a vibration-dampened position. Avoid areas with high humidity or chemical vapors that could affect the thermal relay's timing accuracy. Ensure the pressure connections are leak-tested to the 22 bar maximum to prevent environmental contamination.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Danfoss","offers":[{"title":"Default Title","offer_id":53102416953707,"sku":"060B017291","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/060b017291-nk05yih3ikf.png?v=1776136906","url":"https:\/\/www.plcprotech.com\/products\/060b017291-differential-pressure-switch-with-thermal-time-relay","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}