Danfoss KP, KPI and MBS Data Sheets: The Four Official PDFs Worth Bookmarking
Between them, Danfoss makes two kinds of pressure hardware that show up constantly on hydraulic and pneumatic assemblies: the KP/KPI mechanical switches, which open and close a contact at a set pressure, and the MBS transmitters, which turn pressure into a 4–20 mA or voltage signal for a PLC. Both families are documented with short, well-organised data sheets on Danfoss's own site, but the file names — AI209986438809en and friends — give no clue what is inside, and a site search on danfoss.com tends to return dozens of language variants of the same document.
This page collects the four English data sheets that cover most day-to-day questions, all hosted on Danfoss's official document server. Nothing is stored here; every link goes straight to the PDF on assets.danfoss.com. Before downloading, it is worth knowing which series you are actually dealing with, because KP and KPI look identical from the outside but seal differently.
| Series | What it is | Key figures | Typical use |
|---|---|---|---|
| KP | Pressure switch / thermostat, bellows element, SPDT contact, auto or manual reset | Ambient −40 to 150 °F; media −40 to 212 °F; 16 A / 120 V AC contact load | Steam, air and gaseous media; boiler limiters; dry-run pump protection with the KP44 dual switch |
| KPI | Pressure switch with omega spring between bellows and contact system, so one element handles liquid and gas | IP30 or IP55 enclosures; regulation ranges from −0.2 bar up to 35 bar depending on model | Hydraulic and lubrication circuits where the medium may be liquid, gas or both |
| MBS 8200 / 8250 | Compact 4–20 mA pressure transmitter for heavy-duty hydraulics; the 8250 adds an integrated pulse snubber | Accuracy ±0.5% FS; all-wetted AISI 316L; media/ambient up to 125 °C; output clipping and fault indication | Mobile and industrial hydraulics with cavitation, liquid hammer or pressure peaks |
| MBS 1600 / 1650 | OEM pressure transmitter, four standard output signals; the 1650 adds the pulse snubber | Ranges 0–6 up to 0–2,200 bar; ±0.5% FS; MTTFd over 100 years; immune to VFD noise | OEM machinery and test benches where volume pricing and long service life matter |
Download the official data sheets (PDF)
Data sheet — Pressure switches and thermostats Type KP
The classic KP document: design and function of the snap-action contact system, full technical data for the switch and thermostat versions, wiring and cable-entry details, and the model-by-model regulation range tables.
Data sheet — Pressure switch and thermostat Type KP and KPI, industrial applications
The broader industrial data sheet covering both families side by side, including the KPI omega-spring design, IP55 enclosure options, stainless (AISI 316L) wetted-part versions and the KP44 dual pressure switch for pump protection.
Data sheet — MBS 8200 and MBS 8250 transmitters for heavy-duty applications
Electrical and mechanical specifications for the heavy-duty transmitter pair, with the pulse-snubber explanation, EMC ratings up to 100 V/m at 2 GHz, and the output-clipping behaviour that signals excess pressure to the control system.
Data sheet — MBS 1600 and MBS 1650 OEM transmitters for heavy-duty applications
The compact OEM series document: pressure range and overload tables from 6 to 2,200 bar, output signal options (4–20 mA, 1–5 V, 1–6 V, 0–10 V), mis-wire and short-circuit protection, and MTTFd figures.
One practical note when comparing documents: Danfoss re-releases data sheets frequently and keeps superseded revisions online. If a dimension or accuracy figure differs between a saved copy and a fresh download, trust the newer revision date shown on the cover rather than the file that has been sitting in the project folder.