3 phase generator KS 25-3LM

Voltage230/400 V
Engine brandLaidong
Max power (400V)25.3 kVA
Nominal power (400V)23 kVA

The KS 25-3LM three-phase diesel power station of the HEAVY DUTY series of the German brand “Könner & Söhnen” is a reliable generator set with a maximum capacity of 25.3 kVA. 

The KS 25-3LM diesel generator based on a liquid-cooled Laidong four-cylinder engine is a cost-effective solution from Könner & Söhnen. It conforms to all European quality standards, offers outstanding safety and is thus suitable for private and commercial use. In addition, the KS 25-3LM diesel generator is equipped with a four-pole brushless AC alternator with an automatic voltage regulator, a preheater for use in the cold season, a 57 l fuel tank offering a 14-hour autonomous operation without refueling (fuel consumption is 4.1 liters per hour at an average 50% load), connection for an automatic start/stop system, and an all-weather anti-vandal soundproof housing. 

The KS 25-3LM diesel generator is a high-performance unit featuring a controller for all basic operating parameters and can supply both three-phase and single-phase consumers. With the company's in-house developments and conformity to Könner & Söhnen requirements, all power stations have a margin of power against the declared specifications.

Könner & Söhnen diesel generators accommodate all your needs for both emergency and standby power supply to ensure sustainable power supply to residential buildings and small commercial facilities.


Laidong's low-speed engine runs at 1,500 rpm, which reduces fuel consumption, lowers sound pressure, and promotes longer service life through lower rpm. A mechanical engine speed control unit adjusts the engine speed and controls the quality of the electrical power produced by the generator.


The water-cooled engine system ensures reliable operation of the unit and prevents premature engine failure. The efficient cooling of the engine allows this generator set to be exposed to high ambient temperatures.


The engine preheater facilitates the start-up of the power station with no load on the engine, even in sub-zero temperatures during the cold season. The system automatically pre-heats the engine's water jacket to the required temperature and maintains the engine temperature to facilitate the engine start-up in any weather.


All operations are controlled via a modern multifunctional digital controller. The controller provides monitoring of all operating indicators of the power station, convenient start-up and operation settings, monitoring of the battery status, engine speed and fuel supply adjusted to the load, and protection against overheating and low oil level. It also signals possible faults and reports the need for service maintenance.


The top-notch soundproof housing provides significant noise reduction during unit operation, improves the thermal distribution and protects the power station against ingress of moisture and condensation, exposure to adverse weather conditions and tampering. The relatively compact size of the power station provides more space for its placement. Anti-corrosion powder coating contributes to a longer service life of the unit. 

In addition, the low-noise low-speed engines mounted on anti-vibration pads contribute to quieter operation and reduce the load on the base. 

The power station has an emergency stop button for quick engine shutdown in an emergency.


The housing has openings for transportation aids, facilitating shipment, transportation, and installation of the unit.  Wide hinged doors on both sides of the housing provide unobstructed access to the unit parts for easy servicing of the main components of the diesel generator.


For failure-free operation in Europe, Könner & Söhnen diesel power stations undergo pre-run servicing and a test run with monitoring of all operating parameters at our in-house service center. A special loading bench is used to check the power output of the power station in different operating conditions and to fine-tune the electronics control unit.


The Könner & Söhnen KS 25-3LM diesel power station is a heavy-duty and cost-effective unit incorporating all the necessary features for sustainable and reliable operation and controller for all basic operating parameters. Reinforced parts and mechanisms, strengthened fasteners and joints reduce wear and tear and ensure long and reliable operation of the generator set.

Meticulously monitoring every stage of Könner & Söhnen production, we have created a series of high-quality and reliable HEAVY DUTY Silent Diesel Generators that will serve our customers for many years to come.

All Könner & Söhnen power stations undergo rigorous testing and guarantee high performance and maximum productivity.

Voltage, V
Max power (400V), kVA
Nominal power (400V), kVA
Frequency, Hz
Current (max), А
Avg. working time (power 50%), h***
Fuel consumption***, l/h
4.1 (at 50% load)
Housing type
soundproof, moisture-proof, all-weather, anti-vandal
Noise level Lpa (7m)/Lwa, dB
Control unit
multifunctional digital controller
Controller model
Datakom D300
Alternator type
Stamford type, synchronous, excitation system, AC brushless, four-pole
Engine type
Water-cooled four-cylinder four-stroke diesel engine
Engine brand
Engine model
Engine speed, U/min
Cooling type
Engine speed control
Fuel tank volume, l
Crank case volume, l
Coolant volume, l
Engine cylinder volume, cm3
Power output controller
electronic voltage regulator, smart AVR
Accumulator, A·h
Battery charger
Net dimensions (LxWxH), mm
1700 х 780 х 1000
Gross dimensions (LxWxH), mm
1730 х 810 х 1020
Net weight, kg
Gross weight, kg
Protection class
Nominal voltage tolerance
max. 5%
2 years
EAN code

Assembled in PRC.

**In transient modes, the frequency of the generator can change in the short term, that is, during normal operation of the generator, the deviation of the frequency indicator is permissible. Depending on the type of generator, engine and operating mode, the frequency can be 49-54Hz

***Fuel consumption depends on many factors, such as load, fuel quality, season, altitude, technical condition of the power station.

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