Condor MDR3/11-10A pressure switch for piston compressors 400/50 V/Hz · 3 poles · relay 6,30–10,00 A · max. 11 bar · factory set to 8,0–10,0 bar
Code: MDR3/11-10A
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Product detailed description
A 6.30 to 10.00 A relay in the version with a single 1/4" thread. This is the commonest combination when replacing a worn-out switch on a production three-phase compressor — there the tank ports are usually already in place and no block is needed.
Two things to look at when replacing
First, the motor rated current. It must land inside the 6.30 to 10.00 A range; below or above it, you need a different relay version.
Second, how the old one was connected. If it had a block with four threads, the tank is left with a single port and you will have nowhere to put the gauge and the safety valve — then you need the version with the letter X.
What is in the box
- Switching capacity 7.5 kW at 400 V to EN 60947, insulation voltage 690 V.
- Protection IP 54 — against dust and splashing water from every side.
- Mechanical life over a million operations, at most 120 operations an hour.
- Thermal overload relay included, set to the motor rated current.
- Rotary knob for switching on and off by hand.
- Air temperature −5 to +80 °C.
- Connection 1× 1/4" — a single internal thread.
- Factory set to 8,0–10,0 bar; the screws under the cover change it.
The connection close up
The back with a single internal 1/4" thread and a port for the unloader tube.
How it differs from its siblings
The same relay with a block is MDR3/11X-10A. Weaker is MDR3/11-6A, stronger MDR3/11-16A. For pressures above 11 bar there is one version only, MDR3/16X-10A.
Ventilek recommends
Before you unscrew the old switch, photograph where everything ran. It saves an hour of guessing.
Technical data follow the maker datasheet and the supplier catalogue. The switch must be connected by a person with the appropriate electrical qualification. The pressure is set under pressure and with the electrical supply disconnected.
Additional parameters
| Category: | Pressure switches for compressors: Condor and NE-MA |
|---|---|
| Connecting: | 1/4" |
| Poles: | 3 |
| Switching voltage: | 400/50 V/Hz |
| In stock: | External warehouse |
| Current: | 10A |
| Minimum pressure: | 4.0 bar |
| Maximum pressure: | 11 bars |
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Condor: German precision in pressure control since 1893
In the world of compressors and pumps, the Condor brand is a byword for uncompromising quality, safety and technical excellence. As the inventor of the automatic pressure switch, this German family business with more than 130 years of tradition has grown into the world leader in its field.
History and innovation
The company was founded in 1893 by August Frede. Although it started out making centrifuges and milking machines, the decisive turning point came in 1935, when Condor was granted the world's first patent for an automatic diaphragm switch for pumps. That moment defined the brand's course as a pioneer in pressure control.
Why choose Condor components?
Condor pressure switches (above all the legendary MDR series) are now the standard relied on by respected compressor manufacturers all over the world.
- Extreme service life: Condor products undergo demanding tests (salt spray or water hammer tests, for example) that confirm their exceptional durability.
- Safety and certification: Production takes place in Germany to the strictest standards. Condor holds ISO 9001 certification and numerous international approvals, including versions for explosive atmospheres (ATEX).
- A wide range of uses: From small single-phase compressors (the MDR-1 and MDR-2 series) to powerful industrial machines that require motor overcurrent protection (MDR-3, MDR-5).
A legend called MDR
The MDR name has been on the market for more than 80 years. These switches stand out for their rugged design, high switching accuracy and the option of setting the cut-in and cut-out pressure individually. Thanks to integrated unloader valves they also let the electric motor start easily, with no back pressure.
If you are looking for the best that German engineering has to offer for your compressor or air line, Condor is a safe bet that will repay you with trouble-free operation for many years.