Condor MDR3/11-20A pressure switch for piston compressors 400/50 V/Hz · 3 poles · relay 16,00–20,00 A · max. 11 bar · factory set to 8,0–10,0 bar
Code: MDR3/11-20A
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Product detailed description
The highest protection range in the catalogue: 16.00 to 20.00 A. It is the only version that goes above sixteen amps — and equally the version where it pays to check whether the switch still suffices for the motor itself.
Twenty amps and the ceiling of the switch
The relay will watch up to twenty amps, but the switching capacity of the MDR 3 is 7.5 kW at 400 V. Motors drawing around twenty amps are close to that limit — for them compressor makers usually specify a contactor.
With the switch wired through a contactor it does not carry the motor directly, only its coil. The relay in the switch then does not matter and protection is done by the motor circuit breaker in the panel.
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
Weaker relays are in MDR3/11-16A and MDR3/11-10A. The block version stops at MDR3/11X-16A — the twenty-amp relay is not supplied with a block.
Ventilek recommends
When you are looking at twenty amps, look into the compressor manual too, in case a contactor belongs there.
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: | 20A |
| 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.