DANFOSS KPI Series Pressure Switch is suitable for a wide range of liquids and gases. Its compact design makes installation easy, while the fast-acting pressure response supports precise control. The setpoint can be adjusted to match system requirements, and the rugged construction withstands vibration—making it ideal for industrial applications.
The DANFOSS KPI Series pressure switch is designed for sensing and controlling pressure in systems handling both liquids and gases. Built for industrial and building services applications, it delivers accuracy, stable performance, and long-term durability for continuous operation. With a compact footprint, it is easy to install in tight spaces, and the pressure setpoint can be adjusted to match the requirements of each system.
The KPI Series uses a fast-acting snap-action mechanism to respond quickly to pressure changes and reduce contact bounce—improving both safety and reliability. Its construction is engineered to withstand vibration and impact, making it well suited for demanding industrial environments where equipment runs around the clock.
Explore more pressure control devices in the Pressure Switch category.
The table below shows typical applications for DANFOSS KPI and KP Series pressure switches in HVAC and refrigeration systems, water pumps, booster pump systems, and boiler installations.
P: Primary, S: Secondary
| Application | KPI35-38 | KP1-17 | KP35-36 | KP34-37 | KP44 |
|---|---|---|---|---|---|
| (boiler version) | |||||
| Product Image |  |
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| Air Conditioning | P | ||||
| Chiller | P | ||||
| Refrigerant Air Dryer | P (Ref) | ||||
| Water Pump | P | N/A | S | P | |
| Booster Pump (Dry Run) | P | P | |||
| Air Compressor | P | ||||
| Boiler | S | P | |||
| Media | Gaseous media, liquids, and water | Refrigerants | Steam, air, gaseous media, and liquids | Steam, air, gaseous media, and liquids (water) | Liquids (water) and gaseous media |
| Description | KPI 35, KPI 36 | KPI 38 | |
|---|---|---|---|
| Ambient Temperature [°C] | -40 to 65 °C (for max. 2 hours up to 80 °C) | ||
| Media Temperature [°C] | -40 to 100 °C | ||
| Fluid | Gaseous media and liquids | ||
| Parts in Contact with | Bellows | Phosphor bronze | |
| Fluid | Pressure Connector | Brass | Free-cutting steel (nickel plated) |
| Contact System |  |
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| Single-pole double-throw (SPDT) | |||
| Contact Load (Silver) | Alternating current: AC-1: 10 A, 440 V AC-3: 6 A, 440 V AC-15: 4 A, 440 V |
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| Direct current: DC-13: 12 W, 220 V |
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| Enclosure, IP30 grade | Unit must be mounted on a flat surface / a flat fitting, and all unused holes must be covered | ||
| Enclosure, IP44 grade | Mounted as IP30 plus fitting of top cover, code no. 060-109766 | ||
| Enclosure, IP55 grade | Unit mounted in a special IP55 enclosure, code no. 060-033066 or 060-062866 | ||
| Cable Entry | Rubber cable gland entry for 6–14 mm diameter cables | ||
| Mounted on Back Plate / Wall Bracket | Vibration-proof in the range 0–1000 Hz, 4 g [1 g = 9.81 m/s2] | ||
| Mounted on Angle Bracket | Not recommended in areas where vibrations occur | ||
| Switch type – single pole double throw | Switch action | Application |
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Terminal 1-4 closes at high pressure and opens at low pressure Terminal 1-2 can be used as a low-pressure alarm |
Low-pressure cut-out |
| SPDT | Terminal 1-4 opens at high pressure and opens at low pressure Terminal 1-2 can be used as a high-pressure alarm |
High-pressure cut-out |
It can be used with a wide range of media—such as gases, general liquids, water, steam, and refrigerants—depending on the model selected.
Yes. It is widely used for pressure control and abnormal-pressure protection in water pump and booster pump systems.
The KPI Series is designed to be more compact for general industrial applications, while the KP Series includes variants tailored for specific duties such as boilers or refrigeration.
