Condor MDR3 10/10A Pressure Switch
The Condor MDR3 10/10A pressure switch (pressostat) is a German automatic control device for piston compressors that starts and stops the motor at a preset tank pressure. The integrated 10 A thermal overload relay protects the motor against overloading, while the built-in unloading valve (EV) releases residual cylinder pressure after shutdown, ensuring easy restart.
Product Description
The Condor MDR3 10/10A is a professional pressure switch from the MDR 3 series, manufactured by Condor-Werke (Germany) and designed specifically for small to medium-power compressor units. The switch monitors compressed-air pressure in the receiver tank and automatically starts or stops the compressor to maintain the set pressure range — no operator intervention required.
Part number meaning: «10» = maximum cut-out pressure in bar; «10A» = thermal relay rated current, protecting motors up to 4 kW (single-phase) or up to 11 kW (three-phase).
Technical Specifications
| Parameter | Value |
| Manufacturer | Condor-Werke, Germany |
| Model | MDR3 10/10A |
| Purpose | Automatic control of piston compressors |
| Connection type | Single-phase and three-phase (230/400 V, 50/60 Hz) |
| Thermal overload relay | 10 A — motor overload protection |
| Maximum cut-out pressure | 10 bar |
| Pressure setting range | 4–10 bar |
| Pressure differential (∆p) | Adjustable: 1.0–4.0 bar |
| System connection | G 3/8″ (main), 3 × G 1/4″ (auxiliary ports) |
| Unloading valve | Built-in EV — releases pressure on stop for easy restart |
| Protection class | IP 44 / IP 54 (depending on version) |
| Max. motor power | Up to 4 kW (single-phase) / up to 11 kW (three-phase) |
| Operating temperature | −5 °C … +80 °C |
| Altitude | Up to 1,000 m above sea level |
| Dimensions (L × W × H) | 108 × 81 × 131 mm |
| Weight | ~0.64 kg |
| Compatibility | Piston compressors REMEZA, MZB, Aircast, Fini and equivalents |
Advantages and Key Features
Integrated 10 A thermal overload relay
Protects the compressor motor windings from overheating during overload or seizure. Trips at currents above 10 A — no separate thermal relay required in the control circuit.
Unloading valve (EV) — easy restart
After the compressor stops, the valve automatically releases pressure from the cylinder head. This prevents the motor from starting under load and extends the service life of windings and start capacitors.
Wide pressure setting range
Cut-in and cut-out pressure adjustment is made with two springs: main (∆P — pressure differential) and secondary (Pmax). The 4–10 bar setting range covers most applications: spray painting, tyre fitting, workshops and service garages.
Universal connection — single and three phase
One model is compatible with both single-phase (230 V) and three-phase (400 V) motors. Simplifies spare-part selection — no need to specify the supply type in advance.
Made in Germany — Condor-Werke reliability
Condor-Werke is the world leader in pressure switch manufacturing with over 60 years of experience. MDR 3 series switches are installed on millions of compressors worldwide, including REMEZA, Fini, Abac, Fubag and Elitech.
Compatibility
- REMEZA AirCast piston compressors (СБ4/С, СБ4/C series)
- MZB piston compressors (V, W, FL series)
- Fini, Abac, Fubag, Elitech and equivalent compressors
- Any compressor unit with G 3/8″ receiver thread
Applications
- Automotive service & tyre fitting — maintaining working pressure 6–8 bar
- Spray-painting workshops — stable pressure for spray guns
- Woodworking and furniture production — pneumatic tools
- Compressor repair service centres — OEM switch replacement
- Industrial workshops — general compressed-air supply
Installation and Adjustment
The switch mounts on the compressor receiver via the G 3/8″ threaded flange. The three auxiliary G 1/4″ ports connect the pressure gauge, safety valve and an additional consumer. Pressure thresholds are adjusted by turning the regulating springs under the switch cover. Installation must be carried out by a qualified electrician with the power supply disconnected.
⚠️ Warning: when replacing the switch on a pressurised compressor, always bleed the receiver down to 0 bar first.
Technical specifications
| Parameter | Value |
|---|---|
| Device Type | Electromechanical Pressure Switch (Pressure Switch) |
| Rated Current | 10 A |
| Rated Voltage | 380–400 V, 50 Hz |
| Pressure range | ~4 – 10 bar (adjustable) |
| Maximum pressure | Up to 11 Bar |
| Working contacts | 3-field (NC) |
| Casement protection | IP54 (dust and splash protection) |
| Housing Material | Aluminum casting (flange) |
| Temperature Range | Approximately -5…+80 °C |
| Connecting threads | 3/8″ + 3×1/4″ (variants) |
