Condor pressure switch for ATMOS Perfect 1.1 kW — 09021 400/50 V/Hz · 3 poles · relay 2,50–4,00 A · factory set to 4–10 bar
Code: 09021
Product detailed description
Switch with the smallest relay in the whole range. The range of 2.50 to 4.00 A is the only one that can protect a motor around 1.1 kW — all other versions start at four amps and a weak motor would slip through unprotected.
Why it can't be replaced with a stronger one
The overcurrent relay protects the motor by cutting off the current above the set limit. When the limit is higher than what the motor actually draws, the relay will never trip — not even with a seized bearing or a phase failure. That's why reaching for the nearest stronger unit won't work for a 1.1 kW motor.
The order number comes from ATMOS and the switch is supplied for Perfect 1.1 kW machines. Under the cover, however, it's a standard Condor MDR 3 with a terminal block, so it also fits other compressors with an equally weak three-phase motor.
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 3/8" + 3× 1/4" — one inlet and three outlets on a single block.
- Factory-set to 4–10 bar, adjustable using the screws under the cover.
How it differs from its siblings
For motors from 4 A upwards, there are the MDR3/11X-6A and MDR3/11X-10A, and for the strongest ones the MDR3/11X-16A. The full overview of ranges is in the category overview.
Ventilek’s tip
A stronger relay won't protect a weak motor — it will simply never trip. Here it's essential to match the range correctly.
Technical data correspond to the manufacturer's datasheet and the supplier's 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: | 3/8" + 3 × 1/4" |
| Medium: | Compressed air |
| Adjustable range: | Surge protection |
| Poles: | 3 |
| Scope: | 4.0A |
| Switching voltage: | 400/50 V/Hz |
| Pressure range: | 4 - 10 bar |
| In stock: | In store |
| Switching pressure value: | 8 bar |
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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.